diff --git a/web-api/ruoyi-common/src/main/java/com/ruoyi/common/constant/RedisKey.java b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/constant/RedisKey.java
new file mode 100644
index 0000000..a9ab047
--- /dev/null
+++ b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/constant/RedisKey.java
@@ -0,0 +1,15 @@
+package com.ruoyi.common.constant;
+
+/**
+ * Redis / Spring Cache 名称等常量（与 {@code @Cacheable(cacheNames = ...)}、RedisCacheConfiguration 一致）
+ */
+public final class RedisKey {
+
+    private RedisKey() {
+    }
+
+    /**
+     * Spring Cache 名：部门近七日汇总（{@code @Cacheable} 与 TTL 配置须同名）
+     */
+    public static final String CACHE_DEPT_SUMMARY = "dept_summary";
+}
diff --git a/web-api/ruoyi-framework/src/main/java/com/ruoyi/framework/config/RedisConfig.java b/web-api/ruoyi-framework/src/main/java/com/ruoyi/framework/config/RedisConfig.java
index f5bd47c..9445ca7 100644
--- a/web-api/ruoyi-framework/src/main/java/com/ruoyi/framework/config/RedisConfig.java
+++ b/web-api/ruoyi-framework/src/main/java/com/ruoyi/framework/config/RedisConfig.java
@@ -1,14 +1,19 @@
 package com.ruoyi.framework.config;
 
+import java.time.Duration;
+
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
 import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
+import com.ruoyi.common.constant.RedisKey;
+import org.springframework.boot.autoconfigure.cache.RedisCacheManagerBuilderCustomizer;
 import org.springframework.cache.annotation.CachingConfigurerSupport;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.cache.RedisCacheConfiguration;
 import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.data.redis.core.script.DefaultRedisScript;
@@ -23,6 +28,17 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
 @Configuration
 @EnableCaching
 public class RedisConfig extends CachingConfigurerSupport {
+
+    /**
+     * 部门汇总等缓存单独 TTL（与 {@link RedisKey#CACHE_DEPT_SUMMARY} 对应）
+     */
+    @Bean
+    public RedisCacheManagerBuilderCustomizer deptSummaryCacheTtlCustomizer() {
+        return builder -> builder.withCacheConfiguration(
+                RedisKey.CACHE_DEPT_SUMMARY,
+                RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofMinutes(5)));
+    }
+
     @Bean
     @SuppressWarnings(value = {"unchecked", "rawtypes"})
     public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
diff --git a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiVideoReportDataServiceImpl.java b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiVideoReportDataServiceImpl.java
index 35fe9fb..8a957b1 100644
--- a/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiVideoReportDataServiceImpl.java
+++ b/web-api/ruoyi-system/src/main/java/com/ruoyi/ai/service/impl/AiVideoReportDataServiceImpl.java
@@ -3,6 +3,7 @@ package com.ruoyi.ai.service.impl;
 import com.ruoyi.ai.domain.AiVideoReportData;
 import com.ruoyi.ai.mapper.AiVideoReportDataMapper;
 import com.ruoyi.ai.service.IAiVideoReportDataService;
+import com.ruoyi.common.constant.RedisKey;
 import com.ruoyi.common.core.dto.DeptSummaryDTO;
 import com.ruoyi.common.utils.DateUtils;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -41,7 +42,7 @@ public class AiVideoReportDataServiceImpl implements IAiVideoReportDataService {
      * 部门近七日汇总数据
      */
     @Override
-    @Cacheable(cacheNames = "dept_summary", key = "#deptId")
+    @Cacheable(cacheNames = RedisKey.CACHE_DEPT_SUMMARY, key = "#deptId")
     public DeptSummaryDTO getSevenDayDeptSummaryData(Long deptId) {
         Date endTime = new Date();
         // 获取今天的0点，再减去7天