diff --git a/backend/src/main/java/com/designhub/service/AnalyticsService.java b/backend/src/main/java/com/designhub/service/AnalyticsService.java
index 7dc6f32..e193f09 100644
--- a/backend/src/main/java/com/designhub/service/AnalyticsService.java
+++ b/backend/src/main/java/com/designhub/service/AnalyticsService.java
@@ -843,9 +843,11 @@ public class AnalyticsService {
         LambdaQueryWrapper<User> userQuery = new LambdaQueryWrapper<User>()
             .eq(User::getStatus, 1);
         
-        // 如果指定了部门ID，则按部门过滤
+        // 如果指定了部门ID，获取该部门及其所有子部门
         if (deptId != null) {
-            userQuery.eq(User::getDeptId, deptId);
+            List<Long> targetDeptIds = getDeptAndChildIds(deptId);
+            log.debug("筛选部门: deptId={}, targetDeptIds={}", deptId, targetDeptIds);
+            userQuery.in(User::getDeptId, targetDeptIds);
         }
         
         List<User> allUsers = userMapper.selectList(userQuery);
@@ -867,6 +869,25 @@ public class AnalyticsService {
         return designers;
     }
     
+    /**
+     * 递归获取部门及其所有子部门ID
+     */
+    private List<Long> getDeptAndChildIds(Long deptId) {
+        List<Long> deptIds = new ArrayList<>();
+        deptIds.add(deptId);
+        
+        List<Department> children = departmentMapper.selectList(
+            new LambdaQueryWrapper<Department>()
+                .eq(Department::getParentId, deptId)
+                .eq(Department::getStatus, 1)
+        );
+        
+        for (Department child : children) {
+            deptIds.addAll(getDeptAndChildIds(child.getId()));
+        }
+        return deptIds;
+    }
+    
     // ==================== 流程效率统计 ====================
     
     /**