diff --git a/backend/src/main/java/com/designhub/service/DepartmentService.java b/backend/src/main/java/com/designhub/service/DepartmentService.java
index d25546a..6e16da4 100644
--- a/backend/src/main/java/com/designhub/service/DepartmentService.java
+++ b/backend/src/main/java/com/designhub/service/DepartmentService.java
@@ -164,12 +164,20 @@ public class DepartmentService {
             validateDeptType(request.getDeptType());
             existDept.setDeptType(request.getDeptType());
         }
+        // 处理parentId：允许设置为0来清除（设置为null）
         if (request.getParentId() != null) {
-            existDept.setParentId(request.getParentId());
+            Long parentId = request.getParentId();
+            existDept.setParentId(parentId == 0 ? null : parentId);
         }
+        // 处理leaderId：允许设置为0或null来清除负责人
+        // 注意：由于Java JSON反序列化中无法区分字段不存在和字段为null
+        // 如果前端发送null，这里会收到null，可以设置为null来清除
+        // 如果前端发送0，这里会收到0，也可以设置为null来清除
         if (request.getLeaderId() != null) {
-            existDept.setLeaderId(request.getLeaderId());
+            Long leaderId = request.getLeaderId();
+            existDept.setLeaderId(leaderId == 0 ? null : leaderId);
         }
+        // 注意：如果前端不发送leaderId字段（undefined），这里不会处理，保持原值不变
         if (request.getSortOrder() != null) {
             existDept.setSortOrder(request.getSortOrder());
         }
diff --git a/frontend/src/views/Settings.vue b/frontend/src/views/Settings.vue
index cef7ece..8d03646 100644
--- a/frontend/src/views/Settings.vue
+++ b/frontend/src/views/Settings.vue
@@ -2133,8 +2133,8 @@ const buildDepartmentPayload = (includeInitial: boolean): DepartmentPayload => {
     deptName: formData.department.deptName,
     deptCode: formData.department.deptCode,
     deptType: formData.department.deptType,
-    parentId: formData.department.parentId ?? 0,
-    leaderId: formData.department.leaderId ?? undefined,
+      parentId: formData.department.parentId ?? 0,
+      leaderId: formData.department.leaderId ?? null,  // 使用null而不是undefined，确保可以清除负责人
     sortOrder: formData.department.sortOrder,
     status: formData.department.status,
     allowedDemandTypes: isReceivingDept.value ? formData.department.allowedDemandTypes : [],