diff --git a/apps/admin/src/pages/IntegrationConfig/index.tsx b/apps/admin/src/pages/IntegrationConfig/index.tsx
index 002f8f0..bb2b6a5 100644
--- a/apps/admin/src/pages/IntegrationConfig/index.tsx
+++ b/apps/admin/src/pages/IntegrationConfig/index.tsx
@@ -236,13 +236,7 @@ const IntegrationConfigPage: React.FC = () => {
       const userIds = checkedKeys
         .filter((k) => String(k).startsWith('user-'))
         .map((k) => String(k).replace('user-', ''));
-      const deptKeys = checkedKeys.filter((k) => String(k).startsWith('dept-'));
-      const deptId = deptKeys.length > 0
-        ? Number(String(deptKeys[0]).replace('dept-', ''))
-        : undefined;
-
-      setImporting(true);
-      await api.post('/classes', { ...values, dingUserIds: userIds, departmentId: deptId });
+      await api.post('/classes', { ...values, dingUserIds: userIds });
       message.success('班级创建成功');
       setClassModalOpen(false);
       classForm.resetFields();
diff --git a/apps/server/src/attendance/attendance.service.ts b/apps/server/src/attendance/attendance.service.ts
index 2be1d1d..4667b3e 100644
--- a/apps/server/src/attendance/attendance.service.ts
+++ b/apps/server/src/attendance/attendance.service.ts
@@ -128,7 +128,7 @@ export class AttendanceService {
             status: 'pending',
             source: 'schedule',
           });
-          entity.departmentId = cs.student?.departmentId ?? cls.departmentId ?? undefined;
+          entity.departmentId = cs.student?.departmentId ?? undefined;
           entities.push(entity);
           existingKeys.add(key);
         }
diff --git a/apps/server/src/classes/classes.controller.ts b/apps/server/src/classes/classes.controller.ts
index 3fcd8bf..ebba85f 100644
--- a/apps/server/src/classes/classes.controller.ts
+++ b/apps/server/src/classes/classes.controller.ts
@@ -86,27 +86,6 @@ export class ClassesController {
     return result;
   }
 
-  /** 从钉钉同步部门创建班级 */
-  @Post('from-department')
-  @RequirePermission('class:create')
-  async createFromDepartment(
-    @Body() dto: { departmentId: number; name?: string; classType?: string },
-    @Request() req: any,
-  ) {
-    const result = await this.service.createFromDepartment(dto);
-    await this.logService.log({
-      userId: req.user?.id,
-      username: req.user?.username,
-      module: '班级管理',
-      action: '从部门创建班级',
-      targetId: result.id,
-      targetType: 'class',
-      detail: `班级${result.code} ${result.name}`,
-      ipAddress: extractRequestInfo(req).ipAddress,
-      userAgent: extractRequestInfo(req).userAgent,
-    });
-    return result;
-  }
 
   /** 批量导入学生到班级（通过钉钉用户ID） */
   @Post(':id/students/import')
diff --git a/apps/server/src/classes/classes.service.ts b/apps/server/src/classes/classes.service.ts
index c69c0f1..c29a873 100644
--- a/apps/server/src/classes/classes.service.ts
+++ b/apps/server/src/classes/classes.service.ts
@@ -1,7 +1,7 @@
 import { Injectable, NotFoundException, BadRequestException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository, In, Like } from 'typeorm';
-import { Class, ClassStudent, ClassTeacher, ClassSchedule, AttendanceRecord, Department, Classroom, Student, StudentDingMapping } from '../entities';
+import { Class, ClassStudent, ClassTeacher, ClassSchedule, AttendanceRecord, Classroom, Student, StudentDingMapping } from '../entities';
 import { CreateClassDto, UpdateClassDto, QueryClassDto, AddTeacherDto, QueryClassScheduleDto, QueryClassAttendanceSummaryDto, BatchImportStudentsDto } from './dto/class.dto';
 
 interface RawStudentCount {
@@ -22,8 +22,6 @@ export class ClassesService {
     private scheduleRepo: Repository<ClassSchedule>,
     @InjectRepository(AttendanceRecord)
     private attendanceRepo: Repository<AttendanceRecord>,
-    @InjectRepository(Department)
-    private deptRepo: Repository<Department>,
     @InjectRepository(Student)
     private studentRepo: Repository<Student>,
     @InjectRepository(StudentDingMapping)
@@ -32,7 +30,6 @@ export class ClassesService {
 
   async findAll(query: QueryClassDto) {
     let where: Record<string, unknown> = {};
-    if (query.departmentId) where.departmentId = query.departmentId;
     if (query.status) where.status = query.status;
     if (query.classType) where.classType = query.classType;
     if (query.keyword) where.name = Like(`%${query.keyword}%`);
@@ -99,21 +96,6 @@ export class ClassesService {
   async create(dto: CreateClassDto) {
     const { studentIds, teachers, dingUserIds, ...classData } = dto;
 
-    // Resolve departmentId: frontend may pass DingTalk dept ID, map to local
-    if (classData.departmentId) {
-      const localDept = await this.deptRepo.findOne({
-        where: { source: 'dingtalk', sourceId: String(classData.departmentId) },
-      });
-      if (localDept) {
-        classData.departmentId = localDept.id;
-      } else {
-        // Verify it's a valid local department ID
-        const exists = await this.deptRepo.findOne({ where: { id: classData.departmentId } });
-        if (!exists) {
-          throw new BadRequestException(`部门 ID ${classData.departmentId} 不存在`);
-        }
-      }
-    }
 
     const cls = this.classRepo.create(classData);
     const saved = await this.classRepo.save(cls);
@@ -165,7 +147,7 @@ export class ClassesService {
         this.studentRepo.create({
           name: `dd_${dingUserId}`,
           status: 'active',
-          departmentId: classEntity.departmentId ?? undefined,
+          departmentId: undefined,
         })
       );
       const savedStudents = await this.studentRepo.save(newStudents);
@@ -240,32 +222,6 @@ export class ClassesService {
     return { success: true };
   }
 
-  async createFromDepartment(dto: { departmentId: number; name?: string; classType?: string }) {
-    const dept = await this.deptRepo.findOne({
-      where: { id: dto.departmentId, source: 'dingtalk' },
-    });
-
-    if (!dept) {
-      throw new BadRequestException('所选部门不存在或非钉钉同步部门');
-    }
-
-    const className = dto.name || dept.name;
-    const code = `DT_${dto.departmentId}`;
-
-    const existing = await this.classRepo.findOne({ where: { code } });
-    if (existing) {
-      throw new BadRequestException(`班级"${className}"已存在（编码: ${code}）`);
-    }
-
-    const cls = this.classRepo.create({
-      name: className,
-      code,
-      departmentId: dto.departmentId,
-      classType: dto.classType || 'culture',
-      status: 'enrolling',
-    });
-    return this.classRepo.save(cls);
-  }
 
   async getStudents(classId: number) {
     return this.classStudentRepo.find({
diff --git a/apps/server/src/classes/dto/class.dto.ts b/apps/server/src/classes/dto/class.dto.ts
index e640184..fd7323d 100644
--- a/apps/server/src/classes/dto/class.dto.ts
+++ b/apps/server/src/classes/dto/class.dto.ts
@@ -9,8 +9,6 @@ export class CreateClassDto {
   @IsString() @IsNotEmpty()
   code: string;
 
-  @IsOptional() @IsInt()
-  departmentId?: number;
 
   @IsEnum(ClassType) @IsString() @IsNotEmpty()
   classType: string;
@@ -58,8 +56,6 @@ export class UpdateClassDto {
   @IsOptional() @IsString()
   code?: string;
 
-  @IsOptional() @IsInt()
-  departmentId?: number;
 
   @IsEnum(ClassType) @IsOptional() @IsString()
   classType?: string;
@@ -90,10 +86,6 @@ export class UpdateClassDto {
 }
 
 export class QueryClassDto {
-  @IsOptional()
-  @Type(() => Number)
-  @IsInt()
-  departmentId?: number;
 
   @IsOptional() @IsString()
   status?: string;
diff --git a/apps/server/src/entities/class.entity.ts b/apps/server/src/entities/class.entity.ts
index 171ddc8..242b121 100644
--- a/apps/server/src/entities/class.entity.ts
+++ b/apps/server/src/entities/class.entity.ts
@@ -4,8 +4,6 @@ import {
   Column,
   CreateDateColumn,
   UpdateDateColumn,
-  ManyToOne,
-  JoinColumn,
 } from 'typeorm';
 
 export enum ClassType {
@@ -33,8 +31,6 @@ export class Class {
   @Column({ name: 'code', length: 50, unique: true })
   code: string;
 
-  @Column({ name: 'department_id', type: 'integer', nullable: true })
-  departmentId: number;
 
 
   @Column({ name: 'class_type', length: 20 })
diff --git a/apps/server/src/integration/dingtalk.service.ts b/apps/server/src/integration/dingtalk.service.ts
index 4f3811a..0ab2952 100644
--- a/apps/server/src/integration/dingtalk.service.ts
+++ b/apps/server/src/integration/dingtalk.service.ts
@@ -11,7 +11,6 @@ import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { Department } from '../entities/department.entity';
 import { Student } from '../entities/student.entity';
-import { Class } from '../entities/class.entity';
 import { StudentDingMapping } from '../entities/student-ding-mapping.entity';
 
 // ── Types ──
@@ -189,8 +188,6 @@ export class DingTalkService {
     private readonly studentRepo: Repository<Student>,
     @InjectRepository(StudentDingMapping)
     private readonly studentDingMappingRepo: Repository<StudentDingMapping>,
-    @InjectRepository(Class)
-    private readonly classRepo: Repository<Class>,
   ) {}
 
   private get configured(): boolean {
@@ -381,26 +378,6 @@ export class DingTalkService {
     }
     await this.deptRepo.save(syncedDepts);
 
-    // ── Step 2.5: Auto-create Class for leaf departments ──
-    const parentIds = new Set(syncedDepts.map((d) => d.parentSourceId));
-    const leafDepts = syncedDepts.filter((d) => !parentIds.has(d.sourceId));
-    let classCreated = 0;
-    for (const leaf of leafDepts) {
-      const code = `DT_${leaf.sourceId}`;
-      const exists = await this.classRepo.findOne({ where: { code } });
-      if (!exists) {
-        const cls = this.classRepo.create({
-          name: leaf.name,
-          code,
-          departmentId: leaf.id,
-          classType: 'culture',
-          status: 'enrolling',
-        });
-        await this.classRepo.save(cls);
-        classCreated++;
-      }
-    }
-    if (classCreated > 0) this.logger.log(`从钉钉叶子部门自动创建 ${classCreated} 个班级`);
 
     // ── Step 3: Sync users per department ──
     let userCount = 0;
diff --git a/apps/server/src/schedules/schedules.service.ts b/apps/server/src/schedules/schedules.service.ts
index a448c9d..7e76499 100644
--- a/apps/server/src/schedules/schedules.service.ts
+++ b/apps/server/src/schedules/schedules.service.ts
@@ -52,9 +52,6 @@ export class SchedulesService {
     const schedule = this.scheduleRepo.create(dto);
     if (dto.departmentId) {
       schedule.departmentId = dto.departmentId;
-    } else if (dto.classId) {
-      const cls = await this.classRepo.findOne({ where: { id: dto.classId } });
-      if (cls) schedule.departmentId = cls.departmentId;
     }
     const saved = await this.scheduleRepo.save(schedule);
     return this.findOne(saved.id);
diff --git a/apps/server/src/students/students.service.ts b/apps/server/src/students/students.service.ts
index 5400de4..1e33a76 100644
--- a/apps/server/src/students/students.service.ts
+++ b/apps/server/src/students/students.service.ts
@@ -42,9 +42,6 @@ export class StudentsService {
     const entity = this.repo.create(dto);
     if (dto.departmentId) {
       entity.departmentId = dto.departmentId;
-    } else if (dto.classId) {
-      const cls = await this.classRepo.findOne({ where: { id: dto.classId } });
-      if (cls) entity.departmentId = cls.departmentId;
     }
     return this.repo.save(entity);
   }