diff --git a/admin-ui/src/api/system/dept.js b/admin-ui/src/api/system/dept.js
index 546b482..99d6fe3 100644
--- a/admin-ui/src/api/system/dept.js
+++ b/admin-ui/src/api/system/dept.js
@@ -25,6 +25,23 @@ export function getDept(deptId) {
   })
 }
 
+// 部门火山引擎配置（解密后明文）
+export function getDeptArk(deptId) {
+  return request({
+    url: '/system/dept/ark/' + deptId,
+    method: 'get'
+  })
+}
+
+// 保存部门火山引擎配置
+export function updateDeptArk(data) {
+  return request({
+    url: '/system/dept/ark',
+    method: 'put',
+    data
+  })
+}
+
 // 新增部门
 export function addDept(data) {
   return request({
diff --git a/admin-ui/src/views/system/dept/index.vue b/admin-ui/src/views/system/dept/index.vue
index 53432a2..f2f4b5a 100644
--- a/admin-ui/src/views/system/dept/index.vue
+++ b/admin-ui/src/views/system/dept/index.vue
@@ -65,6 +65,14 @@
       </el-table-column>
       <el-table-column label="操作" align="center" class-name="small-padding fixed-width">
         <template slot-scope="scope">
+          <el-button
+            v-if="isFirstLevelRow(scope.row) || isSecondLevelRow(scope.row)"
+            size="mini"
+            type="text"
+            icon="el-icon-setting"
+            @click="handleArkConfig(scope.row)"
+            v-hasPermi="['system:dept:query', 'system:dept:edit']"
+          >火山配置</el-button>
           <el-button
             size="mini"
             type="text"
@@ -163,11 +171,21 @@
             <p class="model-parm-hint" style="margin: 0; padding-top: 8px">&nbsp;&nbsp;限制本部门下「启用」状态账号数量；0 或不填表示不限制。</p>
           </el-col>
         </el-row>
-        <el-row v-if="isSecondLevelCompanyForm">
+      </el-form>
+      <div slot="footer" class="dialog-footer">
+        <span v-if="isFirstLevelEditForm" class="form-tip">一级部门仅允许修改名称</span>
+        <el-button type="primary" @click="submitForm">确 定</el-button>
+        <el-button @click="cancel">取 消</el-button>
+      </div>
+    </el-dialog>
+
+    <el-dialog title="火山配置" :visible.sync="arkOpen" width="800px" append-to-body @close="resetArkForm">
+      <el-form ref="arkFormRef" :model="arkForm" label-width="120px">
+        <el-row>
           <el-col :span="24">
             <el-form-item label="Byte API Key">
               <el-input
-                v-model="form.byteApiKey"
+                v-model="arkForm.byteApiKey"
                 type="password"
                 show-password
                 placeholder="选填"
@@ -176,11 +194,11 @@
             </el-form-item>
           </el-col>
         </el-row>
-        <el-row v-if="isSecondLevelCompanyForm">
+        <el-row>
           <el-col :span="24">
             <el-form-item label="火山配置项目">
               <el-input
-                v-model="form.project"
+                v-model="arkForm.project"
                 type="password"
                 show-password
                 placeholder="选填"
@@ -189,13 +207,13 @@
             </el-form-item>
           </el-col>
         </el-row>
-        <el-row v-if="isSecondLevelCompanyForm">
+        <el-row>
           <el-col :span="24">
             <el-form-item label="视频模型">
               <div class="model-parm-block">
                 <div
-                  v-for="(row, idx) in modelParamRows"
-                  :key="'mp-' + idx"
+                  v-for="(row, idx) in arkModelParamRows"
+                  :key="'ark-mp-' + idx"
                   class="model-parm-row"
                 >
                   <el-input
@@ -211,13 +229,13 @@
                   <el-button
                     type="text"
                     icon="el-icon-delete"
-                    :disabled="modelParamRows.length <= 1"
-                    @click="removeModelParamRow(idx)"
+                    :disabled="arkModelParamRows.length <= 1"
+                    @click="removeArkModelParamRow(idx)"
                   />
                 </div>
-                <el-button type="text" icon="el-icon-plus" @click="addModelParamRow">添加模型</el-button>
+                <el-button type="text" icon="el-icon-plus" @click="addArkModelParamRow">添加模型</el-button>
                 <p class="model-parm-hint">
-                  保存为 JSON 写入 model_parm；门户「视频生成」按用户所属二级部门读取。
+                  保存为 JSON 写入 ai_dept_ark_config.model_parm；门户「视频生成」按 ai_user.dept_id 与本部门配置读取。
                   留空则使用 portal.video.models。
                 </p>
               </div>
@@ -226,9 +244,8 @@
         </el-row>
       </el-form>
       <div slot="footer" class="dialog-footer">
-        <span v-if="isFirstLevelEditForm" class="form-tip">一级部门仅允许修改名称</span>
-        <el-button type="primary" @click="submitForm">确 定</el-button>
-        <el-button @click="cancel">取 消</el-button>
+        <el-button type="primary" @click="submitArkForm" v-hasPermi="['system:dept:edit']">确 定</el-button>
+        <el-button @click="arkOpen = false">取 消</el-button>
       </div>
     </el-dialog>
   </div>
@@ -265,7 +282,7 @@
 </style>
 
 <script>
-import { listDept, getDept, delDept, addDept, updateDept, listDeptExcludeChild } from "@/api/system/dept"
+import { listDept, getDept, delDept, addDept, updateDept, listDeptExcludeChild, getDeptArk, updateDeptArk } from "@/api/system/dept"
 import Treeselect from "@riophae/vue-treeselect"
 import "@riophae/vue-treeselect/dist/vue-treeselect.css"
 
@@ -287,6 +304,14 @@ export default {
       title: "",
       // 是否显示弹出层
       open: false,
+      arkOpen: false,
+      arkDeptId: null,
+      arkForm: {
+        byteApiKey: undefined,
+        project: undefined,
+        modelParm: undefined
+      },
+      arkModelParamRows: [{ label: '', value: '' }],
       // 是否展开，默认全部展开
       isExpandAll: true,
       // 重新渲染表格状态
@@ -299,7 +324,6 @@ export default {
       // 表单参数
       form: {},
       originalForm: {},
-      modelParamRows: [{ label: '', value: '' }],
       // 表单校验
       rules: {
         parentId: [
@@ -332,17 +356,6 @@ export default {
     this.getList()
   },
   computed: {
-    /** 二级公司：ancestors 为 0,100（即上级为根公司 dept_id=100） */
-    isSecondLevelCompanyForm() {
-      if (this.form.ancestors === "0,100") {
-        return true
-      }
-      const pid = this.form.parentId
-      if (pid !== undefined && pid !== null && Number(pid) === 100) {
-        return true
-      }
-      return false
-    },
     isFirstLevelEditForm() {
       return this.form.deptId !== undefined && this.isFirstLevelRow(this.form)
     }
@@ -371,39 +384,78 @@ export default {
         return current
       })
     },
-    syncModelRowsFromForm() {
-      this.modelParamRows = [{ label: '', value: '' }]
-      const raw = this.form.modelParm
+    syncArkModelRowsFromForm() {
+      this.arkModelParamRows = [{ label: '', value: '' }]
+      const raw = this.arkForm.modelParm
       if (!raw || String(raw).trim() === '') {
         return
       }
       try {
         const arr = JSON.parse(raw)
         if (Array.isArray(arr) && arr.length) {
-          this.modelParamRows = arr.map(x => ({
+          this.arkModelParamRows = arr.map(x => ({
             label: (x && x.label) ? String(x.label) : '',
             value: (x && x.value) ? String(x.value) : ''
           }))
         }
       } catch (e) {
-        this.modelParamRows = [{ label: '', value: '' }]
+        this.arkModelParamRows = [{ label: '', value: '' }]
       }
     },
-    buildModelParmPayload() {
-      if (!this.isSecondLevelCompanyForm) {
+    buildArkModelParmPayload() {
+      const rows = (this.arkModelParamRows || []).filter(r => r.label && r.value)
+      this.arkForm.modelParm = rows.length ? JSON.stringify(rows) : ''
+    },
+    addArkModelParamRow() {
+      this.arkModelParamRows.push({ label: '', value: '' })
+    },
+    removeArkModelParamRow(idx) {
+      if (this.arkModelParamRows.length <= 1) {
         return
       }
-      const rows = (this.modelParamRows || []).filter(r => r.label && r.value)
-      this.form.modelParm = rows.length ? JSON.stringify(rows) : ''
+      this.arkModelParamRows.splice(idx, 1)
     },
-    addModelParamRow() {
-      this.modelParamRows.push({ label: '', value: '' })
+    resetArkForm() {
+      this.arkDeptId = null
+      this.arkForm = {
+        byteApiKey: undefined,
+        project: undefined,
+        modelParm: undefined
+      }
+      this.arkModelParamRows = [{ label: '', value: '' }]
+      if (this.$refs.arkFormRef) {
+        this.$refs.arkFormRef.resetFields()
+      }
     },
-    removeModelParamRow(idx) {
-      if (this.modelParamRows.length <= 1) {
+    handleArkConfig(row) {
+      if (!this.isFirstLevelRow(row) && !this.isSecondLevelRow(row)) {
         return
       }
-      this.modelParamRows.splice(idx, 1)
+      this.arkDeptId = row.deptId
+      getDeptArk(row.deptId).then(response => {
+        const d = response.data || {}
+        this.arkForm = {
+          byteApiKey: d.byteApiKey,
+          project: d.project,
+          modelParm: d.modelParm
+        }
+        this.syncArkModelRowsFromForm()
+        this.arkOpen = true
+      })
+    },
+    submitArkForm() {
+      this.buildArkModelParmPayload()
+      const payload = {
+        deptId: this.arkDeptId,
+        byteApiKey: this.arkForm.byteApiKey !== undefined && this.arkForm.byteApiKey !== null ? this.arkForm.byteApiKey : '',
+        project: this.arkForm.project !== undefined && this.arkForm.project !== null ? this.arkForm.project : '',
+        modelParm: this.arkForm.modelParm !== undefined && this.arkForm.modelParm !== null ? this.arkForm.modelParm : ''
+      }
+      updateDeptArk(payload).then(() => {
+        this.$modal.msgSuccess('保存成功')
+        this.arkOpen = false
+        this.resetArkForm()
+      })
     },
     /** 查询部门列表 */
     getList() {
@@ -441,13 +493,9 @@ export default {
         phone: undefined,
         email: undefined,
         maxUserCount: undefined,
-        byteApiKey: undefined,
-        project: undefined,
-        modelParm: undefined,
         status: "0"
       }
       this.originalForm = {}
-      this.modelParamRows = [{ label: '', value: '' }]
       this.resetForm("form")
     },
     /** 搜索按钮操作 */
@@ -489,7 +537,6 @@ export default {
       getDept(row.deptId).then(response => {
         this.form = response.data
         this.originalForm = { ...response.data }
-        this.syncModelRowsFromForm()
         this.open = true
         this.title = "修改部门"
         listDeptExcludeChild(row.deptId).then(response => {
@@ -506,7 +553,6 @@ export default {
     submitForm: function() {
       this.$refs["form"].validate(valid => {
         if (valid) {
-          this.buildModelParmPayload()
           if (this.form.deptId == undefined && !this.deptOptions.some(item => Number(item.deptId) === Number(this.form.parentId))) {
             this.$modal.msgError("仅允许在一级部门下创建二级部门")
             return
@@ -521,9 +567,6 @@ export default {
               this.form.email = oldDept.email
               this.form.status = oldDept.status
               this.form.maxUserCount = oldDept.maxUserCount
-              this.form.byteApiKey = oldDept.byteApiKey
-              this.form.project = oldDept.project
-              this.form.modelParm = oldDept.modelParm
             }
             updateDept(this.form).then(response => {
               this.$modal.msgSuccess("修改成功")
diff --git a/web-api/ruoyi-admin/src/main/java/com/ruoyi/api/PortalVideoController.java b/web-api/ruoyi-admin/src/main/java/com/ruoyi/api/PortalVideoController.java
index 052ae25..bba09fc 100644
--- a/web-api/ruoyi-admin/src/main/java/com/ruoyi/api/PortalVideoController.java
+++ b/web-api/ruoyi-admin/src/main/java/com/ruoyi/api/PortalVideoController.java
@@ -42,7 +42,7 @@ import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
- * 门户视频生成：按用户二级部门 byte_api_key 调用火山；任务列表含库表与火山过滤列表。
+ * 门户视频生成：按 {@code ai_user.dept_id} 对应 {@code ai_dept_ark_config} 的 API Key 调用火山；任务列表含库表与火山过滤列表。
  */
 @Api(tags = "门户-视频生成")
 @RestController
@@ -104,7 +104,7 @@ public class PortalVideoController extends BaseController {
             }
             return out.isEmpty() ? null : out;
         } catch (Exception e) {
-            logger.warn("解析二级部门 model_parm 失败: {}", e.getMessage());
+            logger.warn("解析部门火山配置 model_parm 失败: {}", e.getMessage());
             return null;
         }
     }
diff --git a/web-api/ruoyi-admin/src/main/java/com/ruoyi/web/controller/system/SysDeptController.java b/web-api/ruoyi-admin/src/main/java/com/ruoyi/web/controller/system/SysDeptController.java
index 328706c..2835342 100644
--- a/web-api/ruoyi-admin/src/main/java/com/ruoyi/web/controller/system/SysDeptController.java
+++ b/web-api/ruoyi-admin/src/main/java/com/ruoyi/web/controller/system/SysDeptController.java
@@ -13,12 +13,15 @@ import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
+import com.ruoyi.ai.domain.AiDeptArkConfig;
+import com.ruoyi.ai.service.IAiDeptArkConfigService;
 import com.ruoyi.ai.service.IDeptChargeRefundService;
 import com.ruoyi.common.annotation.Log;
 import com.ruoyi.common.constant.UserConstants;
 import com.ruoyi.common.core.controller.BaseController;
 import com.ruoyi.common.core.domain.AjaxResult;
 import com.ruoyi.common.core.domain.entity.SysDept;
+import com.ruoyi.common.core.request.system.DeptArkConfigRequest;
 import com.ruoyi.common.core.request.system.DeptChargeRefundRequest;
 import com.ruoyi.common.core.request.system.DeptPointsCorrectionRequest;
 import com.ruoyi.common.enums.BusinessType;
@@ -40,6 +43,9 @@ public class SysDeptController extends BaseController
     @Autowired
     private IDeptChargeRefundService deptChargeRefundService;
 
+    @Autowired
+    private IAiDeptArkConfigService aiDeptArkConfigService;
+
     /**
      * 获取部门列表
      */
@@ -74,6 +80,46 @@ public class SysDeptController extends BaseController
         return success(deptService.selectDeptById(deptId));
     }
 
+    /**
+     * 部门火山引擎配置（解密后明文，无配置时返回仅含 deptId 的空对象）
+     */
+    @PreAuthorize("@ss.hasPermi('system:dept:query')")
+    @GetMapping("/ark/{deptId}")
+    public AjaxResult getArk(@PathVariable Long deptId)
+    {
+        deptService.checkDeptDataScope(deptId);
+        if (!deptService.isArkConfigurableDept(deptId))
+        {
+            return error("仅一级或二级部门可配置火山引擎");
+        }
+        AiDeptArkConfig ark = aiDeptArkConfigService.selectDecryptedByDeptId(deptId);
+        if (ark == null)
+        {
+            AiDeptArkConfig empty = new AiDeptArkConfig();
+            empty.setDeptId(deptId);
+            return success(empty);
+        }
+        return success(ark);
+    }
+
+    /**
+     * 保存部门火山引擎配置（写入 ai_dept_ark_config）
+     */
+    @PreAuthorize("@ss.hasPermi('system:dept:edit')")
+    @Log(title = "部门火山配置", businessType = BusinessType.UPDATE)
+    @PutMapping("/ark")
+    public AjaxResult saveArk(@Validated @RequestBody DeptArkConfigRequest request)
+    {
+        Long deptId = request.getDeptId();
+        deptService.checkDeptDataScope(deptId);
+        if (!deptService.isArkConfigurableDept(deptId))
+        {
+            return error("仅一级或二级部门可配置火山引擎");
+        }
+        aiDeptArkConfigService.saveOrUpdateForDept(deptId, request.getByteApiKey(), request.getProject(), request.getModelParm());
+        return success();
+    }
+
     /**
      * 新增部门
      */
diff --git a/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/domain/entity/SysDept.java b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/domain/entity/SysDept.java
index 6d6138d..cc45db4 100644
--- a/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/domain/entity/SysDept.java
+++ b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/domain/entity/SysDept.java
@@ -53,15 +53,6 @@ public class SysDept extends BaseEntity
     /** 父部门名称 */
     private String parentName;
 
-    /** Byte API Key */
-    private String byteApiKey;
-
-    /** 门户视频模型列表 JSON：[{"label":"…","value":"ep-…"},…] */
-    private String modelParm;
-
-    /** Byte project */
-    private String project;
-
     /** 部门余额 */
     private BigDecimal balance;
 
@@ -187,36 +178,6 @@ public class SysDept extends BaseEntity
         this.parentName = parentName;
     }
 
-    public String getByteApiKey()
-    {
-        return byteApiKey;
-    }
-
-    public void setByteApiKey(String byteApiKey)
-    {
-        this.byteApiKey = byteApiKey;
-    }
-
-    public String getModelParm()
-    {
-        return modelParm;
-    }
-
-    public void setModelParm(String modelParm)
-    {
-        this.modelParm = modelParm;
-    }
-
-    public String getProject()
-    {
-        return project;
-    }
-
-    public void setProject(String project)
-    {
-        this.project = project;
-    }
-
     public BigDecimal getBalance()
     {
         return balance;
@@ -258,9 +219,6 @@ public class SysDept extends BaseEntity
             .append("leader", getLeader())
             .append("phone", getPhone())
             .append("email", getEmail())
-            .append("byteApiKey", getByteApiKey())
-                .append("modelParm", getModelParm())
-                .append("project", getProject())
             .append("balance", getBalance())
             .append("maxUserCount", getMaxUserCount())
             .append("status", getStatus())
diff --git a/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/request/system/DeptArkConfigRequest.java b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/request/system/DeptArkConfigRequest.java
new file mode 100644
index 0000000..2272c50
--- /dev/null
+++ b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/core/request/system/DeptArkConfigRequest.java
@@ -0,0 +1,53 @@
+package com.ruoyi.common.core.request.system;
+
+import javax.validation.constraints.NotNull;
+
+/**
+ * 部门火山引擎配置（保存至 ai_dept_ark_config）
+ */
+public class DeptArkConfigRequest {
+
+    @NotNull(message = "部门ID不能为空")
+    private Long deptId;
+
+    /** 明文；空字符串表示清空 */
+    private String byteApiKey;
+
+    /** 明文；空字符串表示清空 */
+    private String project;
+
+    /** 明文 JSON；空字符串表示清空 */
+    private String modelParm;
+
+    public Long getDeptId() {
+        return deptId;
+    }
+
+    public void setDeptId(Long deptId) {
+        this.deptId = deptId;
+    }
+
+    public String getByteApiKey() {
+        return byteApiKey;
+    }
+
+    public void setByteApiKey(String byteApiKey) {
+        this.byteApiKey = byteApiKey;
+    }
+
+    public String getProject() {
+        return project;
+    }
+
+    public void setProject(String project) {
+        this.project = project;
+    }
+
+    public String getModelParm() {
+        return modelParm;
+    }
+
+    public void setModelParm(String modelParm) {
+        this.modelParm = modelParm;
+    }
+}
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/domain/AiDeptArkConfig.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/domain/AiDeptArkConfig.java
index 1506f96..04d36fe 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/domain/AiDeptArkConfig.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/domain/AiDeptArkConfig.java
@@ -23,7 +23,7 @@ public class AiDeptArkConfig extends BaseEntity {
 
     /** $column.columnComment */
     @TableId(type = IdType.AUTO)
-    private String id;
+    private Long id;
 
     /** 部门ID */
     @Excel(name = "部门ID")
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/mapper/AiUserMapper.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/mapper/AiUserMapper.java
index d5c8c74..84ce461 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/mapper/AiUserMapper.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/mapper/AiUserMapper.java
@@ -26,6 +26,9 @@ public interface AiUserMapper extends BaseMapper<AiUser> {
 
     int countAiUserByDeptId(@Param("deptId") Long deptId);
 
+    /** 归属指定部门的门户用户主键（用于火山 API Key 缓存失效） */
+    List<Long> selectAiUserIdsByDeptId(@Param("deptId") Long deptId);
+
     @Update("update ai_user set dept_id = #{deptId}, update_time = sysdate() where id = #{userId}")
     int updateAiUserDeptId(@Param("userId") Long userId, @Param("deptId") Long deptId);
 }
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IAiDeptArkConfigService.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IAiDeptArkConfigService.java
index 12fcd9e..f4c04ce 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IAiDeptArkConfigService.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IAiDeptArkConfigService.java
@@ -21,6 +21,21 @@ public interface IAiDeptArkConfigService {
      */
     AiDeptArkConfig selectAiDeptArkConfigById(String id);
 
+    /**
+     * 按部门查询火山配置；byte_api_key、project 为解密后的明文（无行返回 null）。
+     */
+    AiDeptArkConfig selectDecryptedByDeptId(Long deptId);
+
+    /**
+     * 按部门物理删除配置行（无行时返回 0）。
+     */
+    int deleteByDeptId(Long deptId);
+
+    /**
+     * 保存或更新指定部门的火山配置；密文字段按与历史 sys_dept 相同规则加密；落库后使该部门下门户用户的 API Key 缓存失效。
+     */
+    void saveOrUpdateForDept(Long deptId, String byteApiKey, String project, String modelParm);
+
     /**
      * 查询团队（部门）对应火山引擎配置列表
      * 
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IByteDeptApiKeyService.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IByteDeptApiKeyService.java
index 468a2ec..921a070 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IByteDeptApiKeyService.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/IByteDeptApiKeyService.java
@@ -1,7 +1,7 @@
 package com.ruoyi.ai.service;
 
 /**
- * 门户用户火山方舟 API Key：取自所属二级部门 {@code sys_dept.byte_api_key}，带 Redis 缓存。
+ * 门户用户火山方舟 API Key：取自 {@code ai_dept_ark_config}（与 {@code ai_user.dept_id} 对应），带 Redis 缓存。
  */
 public interface IByteDeptApiKeyService {
 
@@ -11,13 +11,18 @@ public interface IByteDeptApiKeyService {
     String resolveVolcApiKey(Long aiUserId);
 
     /**
-     * 当前 AI 用户所属二级部门 {@code sys_dept.dept_id}（与 {@link #resolveVolcApiKey(Long)} 中使用的二级节点一致）。
+     * 当前 AI 用户归属部门 {@code ai_user.dept_id}（在仅一级、二级部门树前提下与历史「二级部门」语义对齐；对外方法名保留）。
      * 用户未分配部门或部门数据缺失时返回 null。
      */
     Long resolveSecondLevelDeptId(Long aiUserId);
 
     /**
-     * 当前用户所属二级部门 {@code sys_dept.model_parm}（JSON 模型列表）；未配置或为空时返回 null。
+     * 当前用户归属部门在 {@code ai_dept_ark_config.model_parm} 的 JSON 模型列表；未配置或为空时返回 null。
      */
     String resolveSecondLevelModelParm(Long aiUserId);
+
+    /**
+     * 使 {@code ai_user.dept_id = deptId} 的门户用户的火山 API Key 缓存失效（配置变更或部门删除后调用）。
+     */
+    void evictVolcApiKeyCacheForDept(Long deptId);
 }
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiDeptArkConfigServiceImpl.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiDeptArkConfigServiceImpl.java
index a16a56b..4152174 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiDeptArkConfigServiceImpl.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiDeptArkConfigServiceImpl.java
@@ -1,17 +1,24 @@
 package com.ruoyi.ai.service.impl;
 
+import java.util.Arrays;
 import java.util.List;
+import java.util.stream.Collectors;
+
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
-import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.ruoyi.ai.domain.AiDeptArkConfig;
+import com.ruoyi.ai.mapper.AiDeptArkConfigMapper;
+import com.ruoyi.ai.mapper.AiUserMapper;
+import com.ruoyi.ai.service.IAiDeptArkConfigService;
+import com.ruoyi.common.EncryptionService;
+import com.ruoyi.common.core.redis.RedisCache;
 import com.ruoyi.common.utils.DateUtils;
 import com.ruoyi.common.utils.SecurityUtils;
+import com.ruoyi.common.utils.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
-import com.ruoyi.ai.mapper.AiDeptArkConfigMapper;
-import com.ruoyi.ai.domain.AiDeptArkConfig;
-import com.ruoyi.ai.service.IAiDeptArkConfigService;
 
 /**
  * 团队（部门）对应火山引擎配置Service业务层处理
@@ -22,92 +29,208 @@ import com.ruoyi.ai.service.IAiDeptArkConfigService;
 @Service
 public class AiDeptArkConfigServiceImpl implements IAiDeptArkConfigService {
 
+    private static final String BYTE_API_KEY_CACHE_SUFFIX = "_byte_api_key";
+
     @Autowired
     private AiDeptArkConfigMapper aiDeptArkConfigMapper;
 
-    /**
-     * 查询团队（部门）对应火山引擎配置
-     * 
-     * @param id 团队（部门）对应火山引擎配置主键
-     * @return 团队（部门）对应火山引擎配置
-     */
+    @Autowired
+    private EncryptionService encryptionService;
+
+    @Autowired
+    private RedisCache redisCache;
+
+    @Autowired
+    private AiUserMapper aiUserMapper;
+
     @Override
     public AiDeptArkConfig selectAiDeptArkConfigById(String id) {
-        return aiDeptArkConfigMapper.selectById(id);
+        if (StringUtils.isEmpty(id)) {
+            return null;
+        }
+        AiDeptArkConfig row = aiDeptArkConfigMapper.selectById(Long.parseLong(id.trim()));
+        decryptSensitive(row);
+        return row;
+    }
+
+    @Override
+    public AiDeptArkConfig selectDecryptedByDeptId(Long deptId) {
+        if (deptId == null) {
+            return null;
+        }
+        AiDeptArkConfig row = aiDeptArkConfigMapper.selectOne(
+                Wrappers.<AiDeptArkConfig>lambdaQuery().eq(AiDeptArkConfig::getDeptId, deptId));
+        decryptSensitive(row);
+        return row;
+    }
+
+    @Override
+    public int deleteByDeptId(Long deptId) {
+        if (deptId == null) {
+            return 0;
+        }
+        int n = aiDeptArkConfigMapper.delete(
+                Wrappers.<AiDeptArkConfig>lambdaQuery().eq(AiDeptArkConfig::getDeptId, deptId));
+        evictVolcApiKeyCacheForDept(deptId);
+        return n;
+    }
+
+    @Override
+    public void saveOrUpdateForDept(Long deptId, String byteApiKey, String project, String modelParm) {
+        if (deptId == null) {
+            return;
+        }
+        String keyPlain = blankToNull(byteApiKey);
+        String projectPlain = blankToNull(project);
+        String modelPlain = blankToNull(modelParm);
+
+        AiDeptArkConfig existing = aiDeptArkConfigMapper.selectOne(
+                Wrappers.<AiDeptArkConfig>lambdaQuery().eq(AiDeptArkConfig::getDeptId, deptId));
+        if (existing == null) {
+            AiDeptArkConfig row = new AiDeptArkConfig();
+            row.setDeptId(deptId);
+            row.setByteApiKey(encodeNullable(keyPlain));
+            row.setProject(encodeNullable(projectPlain));
+            row.setModelParm(modelPlain);
+            row.setCreateBy(SecurityUtils.getUsername());
+            row.setCreateTime(DateUtils.getNowDate());
+            aiDeptArkConfigMapper.insert(row);
+        } else {
+            existing.setByteApiKey(encodeNullable(keyPlain));
+            existing.setProject(encodeNullable(projectPlain));
+            existing.setModelParm(modelPlain);
+            existing.setUpdateBy(SecurityUtils.getUsername());
+            existing.setUpdateTime(DateUtils.getNowDate());
+            aiDeptArkConfigMapper.updateById(existing);
+        }
+        evictVolcApiKeyCacheForDept(deptId);
+    }
+
+    private static String blankToNull(String s) {
+        if (s == null) {
+            return null;
+        }
+        String t = s.trim();
+        return t.isEmpty() ? null : t;
+    }
+
+    private String encodeNullable(String plain) {
+        if (plain == null) {
+            return null;
+        }
+        return encryptionService.encode(plain);
+    }
+
+    private void decryptSensitive(AiDeptArkConfig row) {
+        if (row == null) {
+            return;
+        }
+        if (StringUtils.isNotEmpty(row.getByteApiKey())) {
+            row.setByteApiKey(encryptionService.decode(row.getByteApiKey()));
+        }
+        if (StringUtils.isNotEmpty(row.getProject())) {
+            row.setProject(encryptionService.decode(row.getProject()));
+        }
+    }
+
+    private void encryptSensitiveForStore(AiDeptArkConfig row) {
+        if (row == null) {
+            return;
+        }
+        if (StringUtils.isNotEmpty(row.getByteApiKey())) {
+            row.setByteApiKey(encryptionService.encode(row.getByteApiKey()));
+        }
+        if (StringUtils.isNotEmpty(row.getProject())) {
+            row.setProject(encryptionService.encode(row.getProject()));
+        }
+    }
+
+    private void evictVolcApiKeyCacheForDept(Long deptId) {
+        List<Long> userIds = aiUserMapper.selectAiUserIdsByDeptId(deptId);
+        if (userIds == null || userIds.isEmpty()) {
+            return;
+        }
+        for (Long uid : userIds) {
+            if (uid != null) {
+                redisCache.deleteObject(uid + BYTE_API_KEY_CACHE_SUFFIX);
+            }
+        }
     }
 
-    /**
-     * 查询团队（部门）对应火山引擎配置列表
-     * 
-     * @param aiDeptArkConfig 团队（部门）对应火山引擎配置
-     * @return 团队（部门）对应火山引擎配置
-     */
     @Override
     public List<AiDeptArkConfig> selectAiDeptArkConfigList(AiDeptArkConfig aiDeptArkConfig) {
         LambdaQueryWrapper<AiDeptArkConfig> query = Wrappers.lambdaQuery(aiDeptArkConfig);
         query.orderByDesc(AiDeptArkConfig::getId);
-        return aiDeptArkConfigMapper.selectList(query);
+        List<AiDeptArkConfig> list = aiDeptArkConfigMapper.selectList(query);
+        for (AiDeptArkConfig row : list) {
+            decryptSensitive(row);
+        }
+        return list;
     }
 
-    /**
-     * 分页查询团队（部门）对应火山引擎配置列表
-     *
-     * @param aiDeptArkConfig 团队（部门）对应火山引擎配置
-     * @return 团队（部门）对应火山引擎配置
-     */
     @Override
     public IPage<AiDeptArkConfig> selectAiDeptArkConfigPage(Page page, AiDeptArkConfig aiDeptArkConfig) {
         LambdaQueryWrapper<AiDeptArkConfig> query = Wrappers.lambdaQuery(aiDeptArkConfig);
-        return aiDeptArkConfigMapper.selectPage(page, query);
+        IPage<AiDeptArkConfig> result = aiDeptArkConfigMapper.selectPage(page, query);
+        for (AiDeptArkConfig row : result.getRecords()) {
+            decryptSensitive(row);
+        }
+        return result;
     }
 
-    /**
-     * 新增团队（部门）对应火山引擎配置
-     * 
-     * @param aiDeptArkConfig 团队（部门）对应火山引擎配置
-     * @return 结果
-     */
     @Override
     public int insertAiDeptArkConfig(AiDeptArkConfig aiDeptArkConfig) {
+        encryptSensitiveForStore(aiDeptArkConfig);
         aiDeptArkConfig.setCreateBy(SecurityUtils.getUsername());
         aiDeptArkConfig.setCreateTime(DateUtils.getNowDate());
-        return aiDeptArkConfigMapper.insert(aiDeptArkConfig);
+        int r = aiDeptArkConfigMapper.insert(aiDeptArkConfig);
+        if (r > 0 && aiDeptArkConfig.getDeptId() != null) {
+            evictVolcApiKeyCacheForDept(aiDeptArkConfig.getDeptId());
+        }
+        return r;
     }
 
-    /**
-     * 修改团队（部门）对应火山引擎配置
-     * 
-     * @param aiDeptArkConfig 团队（部门）对应火山引擎配置
-     * @return 结果
-     */
     @Override
     public int updateAiDeptArkConfig(AiDeptArkConfig aiDeptArkConfig) {
+        encryptSensitiveForStore(aiDeptArkConfig);
         aiDeptArkConfig.setUpdateBy(SecurityUtils.getUsername());
         aiDeptArkConfig.setUpdateTime(DateUtils.getNowDate());
-        return aiDeptArkConfigMapper.updateById(aiDeptArkConfig);
+        int r = aiDeptArkConfigMapper.updateById(aiDeptArkConfig);
+        if (r > 0 && aiDeptArkConfig.getDeptId() != null) {
+            evictVolcApiKeyCacheForDept(aiDeptArkConfig.getDeptId());
+        }
+        return r;
     }
 
-    /**
-     * 批量删除团队（部门）对应火山引擎配置
-     * 
-     * @param ids 需要删除的团队（部门）对应火山引擎配置主键
-     * @return 结果
-     */
     @Override
-    public int deleteAiDeptArkConfigByIds(String[] ids)
-    {
-        return aiDeptArkConfigMapper.deleteBatchIds(java.util.Arrays.asList(ids));
+    public int deleteAiDeptArkConfigByIds(String[] ids) {
+        if (ids == null || ids.length == 0) {
+            return 0;
+        }
+        List<Long> longIds = Arrays.stream(ids).map(String::trim).filter(StringUtils::isNotEmpty)
+                .map(Long::parseLong).collect(Collectors.toList());
+        List<AiDeptArkConfig> rows = aiDeptArkConfigMapper.selectBatchIds(longIds);
+        int n = aiDeptArkConfigMapper.deleteBatchIds(longIds);
+        if (n > 0) {
+            for (AiDeptArkConfig row : rows) {
+                if (row != null && row.getDeptId() != null) {
+                    evictVolcApiKeyCacheForDept(row.getDeptId());
+                }
+            }
+        }
+        return n;
     }
 
-    /**
-     * 删除团队（部门）对应火山引擎配置信息
-     * 
-     * @param id 团队（部门）对应火山引擎配置主键
-     * @return 结果
-     */
     @Override
-    public int deleteAiDeptArkConfigById(String id)
-    {
-        return aiDeptArkConfigMapper.deleteById(id);
+    public int deleteAiDeptArkConfigById(String id) {
+        if (StringUtils.isEmpty(id)) {
+            return 0;
+        }
+        AiDeptArkConfig row = aiDeptArkConfigMapper.selectById(Long.parseLong(id.trim()));
+        int n = aiDeptArkConfigMapper.deleteById(Long.parseLong(id.trim()));
+        if (n > 0 && row != null && row.getDeptId() != null) {
+            evictVolcApiKeyCacheForDept(row.getDeptId());
+        }
+        return n;
     }
 }
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/BaseByteApiService.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/BaseByteApiService.java
index 30a0deb..3cc916d 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/BaseByteApiService.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/BaseByteApiService.java
@@ -2,13 +2,13 @@ package com.ruoyi.ai.service.impl;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.databind.*;
+import com.ruoyi.ai.domain.AiDeptArkConfig;
 import com.ruoyi.ai.mapper.AiUserMapper;
-import com.ruoyi.common.EncryptionService;
+import com.ruoyi.ai.service.IAiDeptArkConfigService;
 import com.ruoyi.common.core.domain.entity.AiUser;
-import com.ruoyi.common.core.domain.entity.SysDept;
 import com.ruoyi.common.utils.SecurityUtils;
+import com.ruoyi.common.utils.StringUtils;
 import com.ruoyi.common.utils.http.OkHttpUtils;
-import com.ruoyi.system.mapper.SysDeptMapper;
 import lombok.extern.slf4j.Slf4j;
 import okhttp3.*;
 import org.springframework.beans.factory.annotation.Value;
@@ -34,10 +34,7 @@ public class BaseByteApiService {
     @Resource
     private AiUserMapper userMapper;
     @Resource
-    private SysDeptMapper deptMapper;
-    @Resource
-    private EncryptionService encryptionService;
-    protected String DEPT_ANCESTORS_SPLIT = ",";
+    private IAiDeptArkConfigService aiDeptArkConfigService;
     @Value("${volcengine.ak}")
     protected String accessKeyId;
     @Value("${volcengine.sk}")
@@ -70,7 +67,7 @@ public class BaseByteApiService {
             .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
     /**
-     * 根据用户找到对应的project
+     * 根据门户用户 {@code ai_user.dept_id} 对应 {@link AiDeptArkConfig#getProject()}（解密后）解析 project。
      */
     protected String getUserProject() {
         Long userId = SecurityUtils.getAiUserId();
@@ -78,39 +75,14 @@ public class BaseByteApiService {
             return null;
         }
         AiUser user = userMapper.selectAiUserById(userId);
-        if (user == null) {
+        if (user == null || user.getDeptId() == null) {
             return null;
         }
-        // 第二层部门ID，API_KEY放在这里
-        Long secondLvDeptId = getSecondLevelDept(user.getDeptId());
-        if (secondLvDeptId == null) {
+        AiDeptArkConfig ark = aiDeptArkConfigService.selectDecryptedByDeptId(user.getDeptId());
+        if (ark == null || StringUtils.isEmpty(ark.getProject())) {
             return null;
         }
-        SysDept secondDept = deptMapper.selectDeptById(secondLvDeptId);
-        return encryptionService.decode(secondDept.getProject());
-    }
-
-    /**
-     * 找到当前部门所属第二部门ID
-     *
-     * @param deptId 当前部门
-     */
-    protected Long getSecondLevelDept(long deptId) {
-        SysDept dept = deptMapper.selectDeptById(deptId);
-        String ancestors = dept.getAncestors();
-        // 判断是第几层
-        if (ancestors == null || ancestors.isEmpty() || "0".equals(ancestors)) {
-            // 第一层
-            return null;
-        }
-        String[] parentDeptArray = ancestors.split(DEPT_ANCESTORS_SPLIT);
-        int length = parentDeptArray.length;
-        if (length == 2) {
-            // 只有一个上级，所以当前节点是第二层，直接返回
-            return deptId;
-        }
-        // 大于二级
-        return Long.parseLong(parentDeptArray[2]);
+        return ark.getProject().trim();
     }
 
     public <R> R callApi(String action, Object request, Class<R> responseClass) throws IOException {
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/ByteDeptApiKeyServiceImpl.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/ByteDeptApiKeyServiceImpl.java
index 08f0e87..a8b9e47 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/ByteDeptApiKeyServiceImpl.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/ByteDeptApiKeyServiceImpl.java
@@ -1,5 +1,8 @@
 package com.ruoyi.ai.service.impl;
 
+import com.ruoyi.ai.domain.AiDeptArkConfig;
+import com.ruoyi.ai.mapper.AiUserMapper;
+import com.ruoyi.ai.service.IAiDeptArkConfigService;
 import com.ruoyi.ai.service.IAiUserService;
 import com.ruoyi.ai.service.IByteDeptApiKeyService;
 import com.ruoyi.common.EncryptionService;
@@ -14,19 +17,22 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
+import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 @Slf4j
 @Service
 public class ByteDeptApiKeyServiceImpl implements IByteDeptApiKeyService {
 
-    @Resource
-    private EncryptionService encryptionService;
+    private static final String BYTE_API_KEY_CACHE_SUFFIX = "_byte_api_key";
     private static final String NO_DEPT_MSG = "用户未分配部门：请在后台为门户用户设置 ai_user.dept_id（关联 sys_dept.dept_id）";
     private static final String NO_DEPT_ROW_MSG = "用户所属部门不存在或已删除，请核对 ai_user.dept_id";
-    private static final String NO_API_KEY_MSG = "部门未配置火山 API Key：请在 sys_dept 为用户所在部门（或其上级二级部门）配置 byte_api_key";
+    private static final String NO_API_KEY_MSG = "部门未配置火山 API Key：请在后台「部门管理」中为该部门配置火山 API Key（ai_dept_ark_config）";
     private static final int CACHE_HOURS = 1;
 
+    @Resource
+    private EncryptionService encryptionService;
+
     @Autowired
     private RedisCache redisCache;
 
@@ -36,15 +42,20 @@ public class ByteDeptApiKeyServiceImpl implements IByteDeptApiKeyService {
     @Autowired
     private ISysDeptService sysDeptService;
 
+    @Autowired
+    private IAiDeptArkConfigService aiDeptArkConfigService;
+
+    @Autowired
+    private AiUserMapper aiUserMapper;
+
     @Override
     public String resolveVolcApiKey(Long aiUserId) {
         if (aiUserId == null) {
             throw new ServiceException(NO_DEPT_MSG);
         }
-        String cacheKey = aiUserId + "_byte_api_key";
+        String cacheKey = aiUserId + BYTE_API_KEY_CACHE_SUFFIX;
         String cached = redisCache.getCacheObject(cacheKey);
         if (StringUtils.isNotEmpty(cached)) {
-            // 解密：缓存保存加密后的字符串比较安全
             return encryptionService.decode(cached);
         }
         AiUser aiUser = aiUserService.selectAiUserById(aiUserId);
@@ -55,21 +66,11 @@ public class ByteDeptApiKeyServiceImpl implements IByteDeptApiKeyService {
         if (userDept == null) {
             throw new ServiceException(NO_DEPT_ROW_MSG);
         }
-        // 优先使用用户直接归属部门的 Key；多数业务把用户挂在分公司（如 101）并在该节点配 byte_api_key
-        String apiKey = trimKey(userDept.getByteApiKey());
-        if (StringUtils.isEmpty(apiKey)) {
-            Long fallbackDeptId = secondLevelDeptIdFrom(userDept);
-            if (!fallbackDeptId.equals(userDept.getDeptId())) {
-                SysDept keyDept = sysDeptService.selectDeptById(fallbackDeptId);
-                if (keyDept != null) {
-                    apiKey = trimKey(keyDept.getByteApiKey());
-                }
-            }
-        }
+        AiDeptArkConfig ark = aiDeptArkConfigService.selectDecryptedByDeptId(aiUser.getDeptId());
+        String apiKey = ark != null ? trimKey(ark.getByteApiKey()) : null;
         if (StringUtils.isEmpty(apiKey)) {
             throw new ServiceException(NO_API_KEY_MSG);
         }
-        // 缓存中保存加密值
         String encodeApiKey = encryptionService.encode(apiKey);
         redisCache.setCacheObject(cacheKey, encodeApiKey, CACHE_HOURS, TimeUnit.HOURS);
         return apiKey;
@@ -84,59 +85,46 @@ public class ByteDeptApiKeyServiceImpl implements IByteDeptApiKeyService {
         if (aiUser == null || aiUser.getDeptId() == null) {
             return null;
         }
-        SysDept userDept = sysDeptService.selectDeptById(aiUser.getDeptId());
-        if (userDept == null) {
-            return null;
-        }
-        return secondLevelDeptIdFrom(userDept);
+        return aiUser.getDeptId();
     }
 
     @Override
     public String resolveSecondLevelModelParm(Long aiUserId) {
-        Long secondId = resolveSecondLevelDeptId(aiUserId);
-        if (secondId == null) {
+        if (aiUserId == null) {
             return null;
         }
-        SysDept second = sysDeptService.selectDeptById(secondId);
-        if (second == null) {
+        AiUser aiUser = aiUserService.selectAiUserById(aiUserId);
+        if (aiUser == null || aiUser.getDeptId() == null) {
             return null;
         }
-        String raw = second.getModelParm();
+        AiDeptArkConfig ark = aiDeptArkConfigService.selectDecryptedByDeptId(aiUser.getDeptId());
+        if (ark == null) {
+            return null;
+        }
+        String raw = ark.getModelParm();
         if (StringUtils.isEmpty(raw)) {
             return null;
         }
         return raw.trim();
     }
 
+    @Override
+    public void evictVolcApiKeyCacheForDept(Long deptId) {
+        if (deptId == null) {
+            return;
+        }
+        List<Long> userIds = aiUserMapper.selectAiUserIdsByDeptId(deptId);
+        if (userIds == null || userIds.isEmpty()) {
+            return;
+        }
+        for (Long uid : userIds) {
+            if (uid != null) {
+                redisCache.deleteObject(uid + BYTE_API_KEY_CACHE_SUFFIX);
+            }
+        }
+    }
+
     private static String trimKey(String raw) {
         return raw == null ? null : raw.trim();
     }
-
-    /**
-     * 二级部门：祖级路径中，紧接在「一级」（ancestors 第二段）之下的部门节点；
-     * 深度不足时退回用户当前部门。
-     */
-    private Long secondLevelDeptIdFrom(SysDept userDept) {
-        String ancestors = userDept.getAncestors();
-        if (StringUtils.isEmpty(ancestors)) {
-            return userDept.getDeptId();
-        }
-        String[] parts = ancestors.split(",");
-        if (parts.length >= 3) {
-            try {
-                return Long.parseLong(parts[2].trim());
-            } catch (NumberFormatException ignored) {
-                return userDept.getDeptId();
-            }
-        }
-        if (parts.length == 2) {
-            try {
-//                return Long.parseLong(parts[1].trim());
-                return userDept.getDeptId();
-            } catch (NumberFormatException ignored) {
-                return userDept.getDeptId();
-            }
-        }
-        return userDept.getDeptId();
-    }
 }
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/ISysDeptService.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/ISysDeptService.java
index ebdd510..c39401c 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/ISysDeptService.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/ISysDeptService.java
@@ -144,4 +144,9 @@ public interface ISysDeptService
      * 积分更正：更新部门余额并写入集团流水（手动修改类型），不产生充值/退款订单。
      */
     void editScore(DeptPointsCorrectionRequest request);
+
+    /**
+     * 是否允许配置火山引擎（一级或二级部门；与仅两级部门树一致）。
+     */
+    boolean isArkConfigurableDept(Long deptId);
 }
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java
index 6468d44..a9bc237 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java
@@ -9,8 +9,8 @@ import java.util.Objects;
 import java.util.stream.Collectors;
 
 import com.ruoyi.ai.domain.AiGroupBalanceChangeRecord;
+import com.ruoyi.ai.service.IAiDeptArkConfigService;
 import com.ruoyi.ai.service.IAiGroupBalanceChangeRecordService;
-import com.ruoyi.common.EncryptionService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -33,8 +33,6 @@ import com.ruoyi.system.mapper.SysRoleMapper;
 import com.ruoyi.system.mapper.SysUserMapper;
 import com.ruoyi.system.service.ISysDeptService;
 
-import javax.annotation.Resource;
-
 /**
  * 部门管理 服务实现
  * 
@@ -52,12 +50,12 @@ public class SysDeptServiceImpl implements ISysDeptService
     @Autowired
     private SysUserMapper userMapper;
 
-    @Resource
-    private EncryptionService encryptionService;
-
     @Autowired
     private IAiGroupBalanceChangeRecordService aiGroupBalanceChangeRecordService;
 
+    @Autowired
+    private IAiDeptArkConfigService aiDeptArkConfigService;
+
     /**
      * 查询部门管理数据
      * 
@@ -146,14 +144,7 @@ public class SysDeptServiceImpl implements ISysDeptService
     @Override
     public SysDept selectDeptById(Long deptId)
     {
-        SysDept sysDept = deptMapper.selectDeptById(deptId);
-        if (sysDept.getByteApiKey() != null && !sysDept.getByteApiKey().isEmpty()) {
-            sysDept.setByteApiKey(encryptionService.decode(sysDept.getByteApiKey()));
-        }
-        if (sysDept.getProject() != null && !sysDept.getProject().isEmpty()) {
-            sysDept.setProject(encryptionService.decode(sysDept.getProject()));
-        }
-        return sysDept;
+        return deptMapper.selectDeptById(deptId);
     }
 
     /**
@@ -252,12 +243,6 @@ public class SysDeptServiceImpl implements ISysDeptService
             throw new ServiceException("部门停用，不允许新增");
         }
         dept.setAncestors(info.getAncestors() + "," + dept.getParentId());
-        if (StringUtils.isNotEmpty(dept.getByteApiKey())) {
-            dept.setByteApiKey(encryptionService.encode(dept.getByteApiKey()));
-        }
-        if (StringUtils.isNotEmpty(dept.getProject())) {
-            dept.setProject(encryptionService.encode(dept.getProject()));
-        }
         return deptMapper.insertDept(dept);
     }
 
@@ -285,12 +270,6 @@ public class SysDeptServiceImpl implements ISysDeptService
             dept.setAncestors(newAncestors);
             updateDeptChildren(dept.getDeptId(), newAncestors, oldAncestors);
         }
-        if (StringUtils.isNotEmpty(dept.getByteApiKey())) {
-            dept.setByteApiKey(encryptionService.encode(dept.getByteApiKey()));
-        }
-        if (StringUtils.isNotEmpty(dept.getProject())) {
-            dept.setProject(encryptionService.encode(dept.getProject()));
-        }
         int result = deptMapper.updateDept(dept);
         if (UserConstants.DEPT_NORMAL.equals(dept.getStatus()) && StringUtils.isNotEmpty(dept.getAncestors())
                 && !StringUtils.equals("0", dept.getAncestors()))
@@ -357,9 +336,30 @@ public class SysDeptServiceImpl implements ISysDeptService
      * @return 结果
      */
     @Override
+    @Transactional(rollbackFor = Exception.class)
     public int deleteDeptById(Long deptId)
     {
-        return deptMapper.deleteDeptById(deptId);
+        int rows = deptMapper.deleteDeptById(deptId);
+        if (rows > 0)
+        {
+            aiDeptArkConfigService.deleteByDeptId(deptId);
+        }
+        return rows;
+    }
+
+    @Override
+    public boolean isArkConfigurableDept(Long deptId)
+    {
+        if (deptId == null)
+        {
+            return false;
+        }
+        SysDept d = deptMapper.selectDeptById(deptId);
+        if (d == null)
+        {
+            return false;
+        }
+        return isFirstLevelDept(d) || isSecondLevelDept(d);
     }
 
     @Override
@@ -518,9 +518,6 @@ public class SysDeptServiceImpl implements ISysDeptService
             throw new ServiceException("一级部门仅允许修改名称");
         }
         newDept.setAncestors(oldDept.getAncestors());
-        newDept.setByteApiKey(oldDept.getByteApiKey());
-        newDept.setProject(oldDept.getProject());
-        newDept.setModelParm(oldDept.getModelParm());
     }
 
     /**
diff --git a/web-api/ruoyi-system/src/main/resources/mapper/system/AiUserMapper.xml b/web-api/ruoyi-system/src/main/resources/mapper/system/AiUserMapper.xml
index 5af6704..9aef0d2 100644
--- a/web-api/ruoyi-system/src/main/resources/mapper/system/AiUserMapper.xml
+++ b/web-api/ruoyi-system/src/main/resources/mapper/system/AiUserMapper.xml
@@ -86,6 +86,10 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     <select id="countAiUserByDeptId" resultType="int">
         select count(1) from ai_user where del_flag = '0' and dept_id = #{deptId}
     </select>
+
+    <select id="selectAiUserIdsByDeptId" resultType="java.lang.Long">
+        select id from ai_user where del_flag = '0' and dept_id = #{deptId}
+    </select>
     <select id="selectPasswordById" resultType="java.lang.String">
         select password from ai_user where id = #{id}
     </select>
diff --git a/web-api/ruoyi-system/src/main/resources/mapper/system/SysDeptMapper.xml b/web-api/ruoyi-system/src/main/resources/mapper/system/SysDeptMapper.xml
index 9fd582a..1a26b6b 100644
--- a/web-api/ruoyi-system/src/main/resources/mapper/system/SysDeptMapper.xml
+++ b/web-api/ruoyi-system/src/main/resources/mapper/system/SysDeptMapper.xml
@@ -13,8 +13,6 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 		<result property="leader"     column="leader"      />
 		<result property="phone"      column="phone"       />
 		<result property="email"      column="email"       />
-		<result property="byteApiKey" column="byte_api_key" />
-		<result property="modelParm" column="model_parm" />
 		<result property="status"     column="status"      />
 		<result property="delFlag"    column="del_flag"    />
 		<result property="parentName" column="parent_name" />
@@ -28,7 +26,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</resultMap>
 	
 	<sql id="selectDeptVo">
-        select d.dept_id, d.parent_id, d.ancestors, d.dept_name, d.order_num, d.leader, d.phone, d.email, d.byte_api_key, d.status, d.del_flag, d.create_by, d.create_time, d.project, d.balance, d.max_user_count
+        select d.dept_id, d.parent_id, d.ancestors, d.dept_name, d.order_num, d.leader, d.phone, d.email, d.status, d.del_flag, d.create_by, d.create_time, d.balance, d.max_user_count
         from sys_dept d
     </sql>
     
@@ -64,7 +62,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</select>
     
 	<select id="selectDeptById" parameterType="Long" resultMap="SysDeptResult">
-		select d.dept_id, d.parent_id, d.ancestors, d.dept_name, d.order_num, d.leader, d.phone, d.email, d.byte_api_key, d.model_parm, d.status, d.project, d.balance, d.max_user_count,
+		select d.dept_id, d.parent_id, d.ancestors, d.dept_name, d.order_num, d.leader, d.phone, d.email, d.status, d.balance, d.max_user_count,
 			(select dept_name from sys_dept where dept_id = d.parent_id) parent_name
 		from sys_dept d
 		where d.dept_id = #{deptId}
@@ -79,8 +77,9 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 		where del_flag = '0' and parent_id = #{deptId} limit 1
 	</select>
 	
-	<select id="selectChildrenDeptById" parameterType="Long" resultMap="SysDeptResult">
-		select * from sys_dept where find_in_set(#{deptId}, ancestors)
+    <select id="selectChildrenDeptById" parameterType="Long" resultMap="SysDeptResult">
+		select d.dept_id, d.parent_id, d.ancestors, d.dept_name, d.order_num, d.leader, d.phone, d.email, d.status, d.del_flag, d.create_by, d.create_time, d.update_by, d.update_time, d.balance, d.max_user_count
+		from sys_dept d where find_in_set(#{deptId}, d.ancestors)
 	</select>
 	
 	<select id="selectNormalChildrenDeptById" parameterType="Long" resultType="int">
@@ -106,9 +105,6 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  			<if test="leader != null and leader != ''">leader,</if>
  			<if test="phone != null and phone != ''">phone,</if>
  			<if test="email != null and email != ''">email,</if>
-			<if test="byteApiKey != null">byte_api_key,</if>
-			<if test="modelParm != null">model_parm,</if>
-			<if test="project != null">project,</if>
 			<if test="balance != null">balance,</if>
 			<if test="maxUserCount != null">max_user_count,</if>
  			<if test="status != null">status,</if>
@@ -123,9 +119,6 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  			<if test="leader != null and leader != ''">#{leader},</if>
  			<if test="phone != null and phone != ''">#{phone},</if>
  			<if test="email != null and email != ''">#{email},</if>
-			<if test="byteApiKey != null">#{byteApiKey},</if>
-			<if test="modelParm != null">#{modelParm},</if>
-			<if test="project != null">#{project},</if>
 			<if test="balance != null">#{balance},</if>
 			<if test="maxUserCount != null">#{maxUserCount},</if>
  			<if test="status != null">#{status},</if>
@@ -144,9 +137,6 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  			<if test="leader != null">leader = #{leader},</if>
  			<if test="phone != null">phone = #{phone},</if>
  			<if test="email != null">email = #{email},</if>
-			<if test="byteApiKey != null">byte_api_key = #{byteApiKey},</if>
-			<if test="modelParm != null">model_parm = #{modelParm},</if>
-			<if test="project != null">project = #{project},</if>
 			<if test="balance != null">balance = #{balance},</if>
 			<if test="maxUserCount != null">max_user_count = #{maxUserCount},</if>
  			<if test="status != null and status != ''">status = #{status},</if>
diff --git a/web-api/sql/dept-ark-config-migrate.sql b/web-api/sql/dept-ark-config-migrate.sql
new file mode 100644
index 0000000..57784bf
--- /dev/null
+++ b/web-api/sql/dept-ark-config-migrate.sql
@@ -0,0 +1,39 @@
+-- =============================================================================
+-- 部门火山配置迁表：ai_dept_ark_config 唯一约束、数据搬迁、sys_dept 删除三列
+-- 部署顺序：在已有 ai_dept_ark_config 与 sys_dept 火山列的前提下执行；
+-- 可重复执行 INSERT 段（NOT EXISTS 跳过已搬迁行）。
+-- =============================================================================
+
+-- 1) 一部门一行（若已存在同名索引请跳过本步）
+ALTER TABLE `ai_dept_ark_config`
+    ADD UNIQUE INDEX `uk_dept_id` (`dept_id`);
+
+-- 2) 从 sys_dept 搬迁至 ai_dept_ark_config（仅一级、二级部门，且三字段至少其一非空）
+INSERT INTO `ai_dept_ark_config` (`dept_id`, `model_parm`, `project`, `byte_api_key`, `create_time`)
+SELECT
+    d.`dept_id`,
+    d.`model_parm`,
+    d.`project`,
+    d.`byte_api_key`,
+    NOW()
+FROM `sys_dept` d
+WHERE d.`del_flag` = '0'
+  AND d.`ancestors` IS NOT NULL
+  AND (
+        (d.`parent_id` = 0 AND d.`ancestors` = '0')
+        OR (CHAR_LENGTH(d.`ancestors`) - CHAR_LENGTH(REPLACE(d.`ancestors`, ',', ''))) = 1
+    )
+  AND (
+        NULLIF(TRIM(d.`byte_api_key`), '') IS NOT NULL
+        OR NULLIF(TRIM(d.`project`), '') IS NOT NULL
+        OR NULLIF(TRIM(d.`model_parm`), '') IS NOT NULL
+    )
+  AND NOT EXISTS (
+        SELECT 1 FROM `ai_dept_ark_config` a WHERE a.`dept_id` = d.`dept_id`
+    );
+
+-- 3) 删除 sys_dept 上已迁移的火山列（搬迁完成后再执行）
+ALTER TABLE `sys_dept`
+    DROP COLUMN `byte_api_key`,
+    DROP COLUMN `project`,
+    DROP COLUMN `model_parm`;