diff --git a/playedu-api/src/main/java/xyz/playedu/api/controller/backend/DepartmentController.java b/playedu-api/src/main/java/xyz/playedu/api/controller/backend/DepartmentController.java
index 8572688..317055b 100644
--- a/playedu-api/src/main/java/xyz/playedu/api/controller/backend/DepartmentController.java
+++ b/playedu-api/src/main/java/xyz/playedu/api/controller/backend/DepartmentController.java
@@ -38,6 +38,7 @@ import xyz.playedu.common.domain.Department;
 import xyz.playedu.common.domain.User;
 import xyz.playedu.common.exception.NotFoundException;
 import xyz.playedu.common.service.DepartmentService;
+import xyz.playedu.common.service.UserDepartmentService;
 import xyz.playedu.common.service.UserService;
 import xyz.playedu.common.types.JsonResponse;
 import xyz.playedu.common.types.paginate.PaginationResult;
@@ -71,12 +72,39 @@ public class DepartmentController {
 
     @Autowired private LDAPBus ldapBus;
 
+    @Autowired private UserDepartmentService userDepartmentService;
+
     @GetMapping("/index")
     @Log(title = "部门-列表", businessType = BusinessTypeConstant.GET)
     public JsonResponse index() {
         HashMap<String, Object> data = new HashMap<>();
         data.put("departments", departmentService.groupByParent());
-        data.put("dep_user_count", departmentService.getDepartmentsUserCount());
+
+        HashMap<Integer, Integer> depUserCount = new HashMap<>();
+        List<Department> allDepartmentList = departmentService.all();
+        if (StringUtil.isNotEmpty(allDepartmentList)) {
+            for (Department dep : allDepartmentList) {
+                List<Integer> depIds = new ArrayList<>();
+                depIds.add(dep.getId());
+                String parentChain = "";
+                if (StringUtil.isEmpty(dep.getParentChain())) {
+                    parentChain = dep.getId() + "";
+                } else {
+                    parentChain = dep.getParentChain() + "," + dep.getId();
+                }
+                // 获取所有子部门ID
+                List<Department> childDepartmentList =
+                        departmentService.getChildDepartmentsByParentChain(
+                                dep.getId(), parentChain);
+                if (StringUtil.isNotEmpty(childDepartmentList)) {
+                    depIds.addAll(childDepartmentList.stream().map(Department::getId).toList());
+                }
+                List<Integer> departmentUserIds = userDepartmentService.getUserIdsByDepIds(depIds);
+                depUserCount.put(
+                        dep.getId(), departmentUserIds.stream().distinct().toList().size());
+            }
+        }
+        data.put("dep_user_count", depUserCount);
         data.put("user_total", userService.total());
         return JsonResponse.data(data);
     }
diff --git a/playedu-api/src/main/java/xyz/playedu/api/controller/backend/UserController.java b/playedu-api/src/main/java/xyz/playedu/api/controller/backend/UserController.java
index 6c1e56a..8b4e906 100644
--- a/playedu-api/src/main/java/xyz/playedu/api/controller/backend/UserController.java
+++ b/playedu-api/src/main/java/xyz/playedu/api/controller/backend/UserController.java
@@ -107,11 +107,31 @@ public class UserController {
         String createdAt = MapUtils.getString(params, "created_at");
         String depIdsStr = MapUtils.getString(params, "dep_ids");
         List<Integer> depIds = null;
-        if (depIdsStr != null && !depIdsStr.trim().isEmpty()) {
-            if ("0".equals(depIdsStr)) {
-                depIds = new ArrayList<>();
-            } else {
-                depIds = Arrays.stream(depIdsStr.split(",")).map(Integer::valueOf).toList();
+        if (StringUtil.isNotEmpty(depIdsStr)) {
+            depIds = new ArrayList<>();
+            if (!"0".equals(depIdsStr)) {
+                List<Department> departmentList =
+                        departmentService.chunk(
+                                Arrays.stream(depIdsStr.split(",")).map(Integer::valueOf).toList());
+                if (StringUtil.isNotEmpty(departmentList)) {
+                    for (Department dep : departmentList) {
+                        depIds.add(dep.getId());
+                        String parentChain = "";
+                        if (StringUtil.isEmpty(dep.getParentChain())) {
+                            parentChain = dep.getId() + "";
+                        } else {
+                            parentChain = dep.getParentChain() + "," + dep.getId();
+                        }
+                        // 获取所有子部门ID
+                        List<Department> childDepartmentList =
+                                departmentService.getChildDepartmentsByParentChain(
+                                        dep.getId(), parentChain);
+                        if (StringUtil.isNotEmpty(childDepartmentList)) {
+                            depIds.addAll(
+                                    childDepartmentList.stream().map(Department::getId).toList());
+                        }
+                    }
+                }
             }
         }
 
diff --git a/playedu-common/src/main/java/xyz/playedu/common/service/DepartmentService.java b/playedu-common/src/main/java/xyz/playedu/common/service/DepartmentService.java
index cc0e090..989aefd 100644
--- a/playedu-common/src/main/java/xyz/playedu/common/service/DepartmentService.java
+++ b/playedu-common/src/main/java/xyz/playedu/common/service/DepartmentService.java
@@ -70,4 +70,6 @@ public interface DepartmentService extends IService<Department> {
     Department findByName(String name, Integer parentId);
 
     List<Department> getChildDepartmentsByParentId(Integer parentId);
+
+    List<Department> getChildDepartmentsByParentChain(Integer parentId, String parentChain);
 }
diff --git a/playedu-common/src/main/java/xyz/playedu/common/service/impl/DepartmentServiceImpl.java b/playedu-common/src/main/java/xyz/playedu/common/service/impl/DepartmentServiceImpl.java
index 6f8cf25..b96cc91 100644
--- a/playedu-common/src/main/java/xyz/playedu/common/service/impl/DepartmentServiceImpl.java
+++ b/playedu-common/src/main/java/xyz/playedu/common/service/impl/DepartmentServiceImpl.java
@@ -32,6 +32,7 @@ import xyz.playedu.common.mapper.DepartmentMapper;
 import xyz.playedu.common.service.DepartmentService;
 import xyz.playedu.common.service.UserDepartmentService;
 import xyz.playedu.common.types.mapper.DepartmentsUserCountMapRes;
+import xyz.playedu.common.util.StringUtil;
 
 import java.util.*;
 import java.util.stream.Collectors;
@@ -302,4 +303,16 @@ public class DepartmentServiceImpl extends ServiceImpl<DepartmentMapper, Departm
                         .or()
                         .likeRight("parent_chain", parentId + ","));
     }
+
+    @Override
+    public List<Department> getChildDepartmentsByParentChain(Integer parentId, String parentChain) {
+        if (StringUtil.isEmpty(parentChain)) {
+            return new ArrayList<>();
+        }
+        return list(
+                query().getWrapper()
+                        .eq("parent_id", parentId)
+                        .or()
+                        .likeRight("parent_chain", parentChain + ","));
+    }
 }