diff --git a/apps/server/src/integration/dingtalk.service.ts b/apps/server/src/integration/dingtalk.service.ts
index efcbe62..5f8e4a5 100644
--- a/apps/server/src/integration/dingtalk.service.ts
+++ b/apps/server/src/integration/dingtalk.service.ts
@@ -352,25 +352,19 @@ export class DingTalkService {
     };
     collectIds(deptTree);
 
-    // 3. 从每个部门拉用户，找到用户所属的叶子部门（支持多分支）
+    // 3. 从每个部门拉用户，每人只挂到一个部门（dept_id_list 最后一个）
+    const allDeptIdsSet = new Set(allDeptIds);
     const usersByDept = new Map<number, Array<{ userid: string; name: string; mobile: string; deptIds: number[] }>>();
-    const seenUsers = new Set<string>();
+    const placedUsers = new Set<string>();
     for (const did of allDeptIds) {
       const deptUsers = await this.getDeptUsers(token, did);
       for (const u of deptUsers) {
-        if (seenUsers.has(u.userid)) continue;
-        seenUsers.add(u.userid);
-        // 找到所有叶子部门：链 [1,2,3,1,4,5] → 叶子 [3,5]
-        const leafDepts: number[] = [];
-        for (let i = 0; i < u.dept_id_list.length; i++) {
-          const next = u.dept_id_list[i + 1];
-          if (next === undefined || next <= u.dept_id_list[i]) {
-            leafDepts.push(u.dept_id_list[i]);
-          }
-        }
-        for (const ld of leafDepts) {
-          if (!usersByDept.has(ld)) usersByDept.set(ld, []);
-          usersByDept.get(ld)!.push({ userid: u.userid, name: u.name, mobile: u.mobile, deptIds: u.dept_id_list });
+        if (placedUsers.has(u.userid)) continue;
+        const targetDept = u.dept_id_list[u.dept_id_list.length - 1];
+        if (allDeptIdsSet.has(targetDept)) {
+          placedUsers.add(u.userid);
+          if (!usersByDept.has(targetDept)) usersByDept.set(targetDept, []);
+          usersByDept.get(targetDept)!.push({ userid: u.userid, name: u.name, mobile: u.mobile, deptIds: u.dept_id_list });
         }
       }
     }