diff --git a/frontend/src/views/Settings.vue b/frontend/src/views/Settings.vue
index d24f6dd..28249fb 100644
--- a/frontend/src/views/Settings.vue
+++ b/frontend/src/views/Settings.vue
@@ -2134,8 +2134,8 @@ const buildDepartmentPayload = (includeInitial: boolean): DepartmentPayload => {
     deptCode: formData.department.deptCode,
     deptType: formData.department.deptType,
     parentId: formData.department.parentId ?? 0,
-    // leaderId: 总是发送字段，null表示清除，数字表示设置
-    leaderId: formData.department.leaderId ?? null,
+    // leaderId: null/undefined转换为0表示清除（后端会将0转换为null），数字表示设置
+    leaderId: formData.department.leaderId != null && formData.department.leaderId !== undefined ? formData.department.leaderId : 0,
     sortOrder: formData.department.sortOrder,
     status: formData.department.status,
     allowedDemandTypes: isReceivingDept.value ? formData.department.allowedDemandTypes : [],