diff --git a/apps/server/src/integration/dingtalk-student-sync.ts b/apps/server/src/integration/dingtalk-student-sync.ts
index bda0305..437e38a 100644
--- a/apps/server/src/integration/dingtalk-student-sync.ts
+++ b/apps/server/src/integration/dingtalk-student-sync.ts
@@ -1,3 +1,4 @@
+import { BadRequestException } from '@nestjs/common';
 import { EntityManager, In } from 'typeorm';
 import { Organization, Student, StudentDingMapping } from '../entities';
 
@@ -37,7 +38,11 @@ export async function syncDingTalkStudents(
     const name = input.name?.trim();
     const mobile = input.mobile?.trim() || undefined;
     if (!dingUserId || dingUserId.length > 100 || !name || name.length > 50) {
-      conflicts.push({ dingUserId: dingUserId || '', name: name || '', reason: '钉钉用户ID或姓名无效' });
+      conflicts.push({
+        dingUserId: dingUserId || '',
+        name: name || '',
+        reason: '钉钉用户ID或姓名无效',
+      });
       continue;
     }
     if (mobile && mobile.length > 20) {
@@ -94,7 +99,9 @@ export async function syncDingTalkStudents(
   }
 
   const newUsers = [...users.values()].filter((user) => !mappingByDingId.has(user.dingUserId));
-  const mobiles = [...new Set(newUsers.map((user) => user.mobile).filter((mobile): mobile is string => !!mobile))];
+  const mobiles = [
+    ...new Set(newUsers.map((user) => user.mobile).filter((mobile): mobile is string => !!mobile)),
+  ];
   const occupiedPhones = mobiles.length
     ? await manager.find(Student, { where: { phone: In(mobiles) } })
     : [];
@@ -144,7 +151,9 @@ export async function syncDingTalkStudents(
   const host = creatable.length
     ? await manager.findOne(Organization, { where: { isHost: true, status: 'active' } })
     : null;
-  if (creatable.length && !host) throw new Error('尚未配置本机构');
+  // 配置缺失属于业务错误（与其他模块一致抛 BadRequestException），
+  // 调用方 create() 据此判定为数据错误并补偿删除已建班级
+  if (creatable.length && !host) throw new BadRequestException('尚未配置本机构');
 
   const bindableStudent = new Map<string, Student>();
   for (const user of bindable) {
@@ -206,7 +215,9 @@ export async function syncDingTalkStudents(
         }),
       ),
     );
-    createdStudents.forEach((student, index) => studentIds.set(creatable[index].dingUserId, student.id));
+    createdStudents.forEach((student, index) =>
+      studentIds.set(creatable[index].dingUserId, student.id),
+    );
   }
 
   return {