diff --git a/apps/server/src/classroom-rentals/classroom-rentals.service.spec.ts b/apps/server/src/classroom-rentals/classroom-rentals.service.spec.ts
new file mode 100644
index 0000000..32b61f7
--- /dev/null
+++ b/apps/server/src/classroom-rentals/classroom-rentals.service.spec.ts
@@ -0,0 +1,89 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+import { ConflictException } from '@nestjs/common';
+import { Repository } from 'typeorm';
+import { ClassroomRentalsService } from './classroom-rentals.service';
+import { ClassroomRental } from '../entities/classroom-rental.entity';
+import { Classroom } from '../entities/classroom.entity';
+import { Tenant } from '../entities/tenant.entity';
+import { ClassSchedule } from '../entities/class-schedule.entity';
+import { CampusScope } from '../common/campus-scope';
+
+function mockQueryBuilder<T>(results: T[] = []) {
+  const qb = {
+    where: jest.fn().mockReturnThis(),
+    andWhere: jest.fn().mockReturnThis(),
+    leftJoinAndSelect: jest.fn().mockReturnThis(),
+    getMany: jest.fn().mockResolvedValue(results),
+  };
+  return qb;
+}
+
+describe('ClassroomRentalsService — findConflicts', () => {
+  let service: ClassroomRentalsService;
+  let rentalRepo: jest.Mocked<Pick<Repository<ClassroomRental>, 'createQueryBuilder'>>;
+  let scheduleRepo: jest.Mocked<Pick<Repository<ClassSchedule>, 'createQueryBuilder'>>;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        ClassroomRentalsService,
+        { provide: getRepositoryToken(ClassroomRental), useValue: { createQueryBuilder: jest.fn() } },
+        { provide: getRepositoryToken(Classroom), useValue: {} },
+        { provide: getRepositoryToken(Tenant), useValue: {} },
+        { provide: getRepositoryToken(ClassSchedule), useValue: { createQueryBuilder: jest.fn() } },
+        { provide: CampusScope, useValue: { getScopeDepartmentIds: jest.fn().mockResolvedValue(null) } },
+      ],
+    }).compile();
+
+    service = module.get<ClassroomRentalsService>(ClassroomRentalsService);
+    rentalRepo = module.get(getRepositoryToken(ClassroomRental));
+    scheduleRepo = module.get(getRepositoryToken(ClassSchedule));
+  });
+
+  it('returns rental conflicts when no schedule conflicts exist', async () => {
+    const rental = { id: 1, startDate: '2026-03-01', endDate: '2026-03-31', tenant: { name: 'A机构' } } as ClassroomRental;
+    const rentalQb = mockQueryBuilder<ClassroomRental>([rental]);
+    const scheduleQb = mockQueryBuilder<ClassSchedule>([]);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(scheduleQb);
+
+    const result = await service.findConflicts(1, '2026-03-15', '2026-04-15');
+
+    expect(result).toHaveLength(1);
+    expect(result[0].id).toBe(1);
+  });
+
+  it('throws ConflictException when an active schedule overlaps the same classroom and date range', async () => {
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
+    const scheduleQb = mockQueryBuilder<ClassSchedule>([
+      { id: 5, subject: '数学', startDate: '2026-03-01', endDate: '2026-06-30' } as ClassSchedule,
+    ]);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(scheduleQb);
+
+    await expect(service.findConflicts(1, '2026-03-15', '2026-04-15')).rejects.toThrow(ConflictException);
+  });
+
+  it('does not throw when schedule is outside the requested date range', async () => {
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
+    const scheduleQb = mockQueryBuilder<ClassSchedule>([]);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(scheduleQb);
+
+    const result = await service.findConflicts(1, '2026-07-01', '2026-08-31');
+
+    expect(result).toHaveLength(0);
+  });
+
+  it('excludes the given rental id from rental conflict check', async () => {
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
+    const scheduleQb = mockQueryBuilder<ClassSchedule>([]);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(scheduleQb);
+
+    await service.findConflicts(1, '2026-03-01', '2026-03-31', 99);
+
+    expect(rentalQb.andWhere).toHaveBeenCalledWith('r.id != :excludeId', { excludeId: 99 });
+  });
+});
diff --git a/apps/server/src/classroom-rentals/classroom-rentals.service.ts b/apps/server/src/classroom-rentals/classroom-rentals.service.ts
index 9e79881..ec76b96 100644
--- a/apps/server/src/classroom-rentals/classroom-rentals.service.ts
+++ b/apps/server/src/classroom-rentals/classroom-rentals.service.ts
@@ -84,7 +84,7 @@ export class ClassroomRentalsService {
   }
 
   /**
-   * 查找与给定区间冲突的租赁订单
+   * 查找与给定区间冲突的租赁订单，同时检测同一教室同一日期段的内部排课
    * 重叠判定：start1 <= end2 AND start2 <= end1
    */
   async findConflicts(classroomId: number, startDate: string, endDate: string, excludeId?: number) {
@@ -96,7 +96,30 @@ export class ClassroomRentalsService {
       .andWhere('r.startDate <= :end', { end: endDate })
       .andWhere('r.endDate >= :start', { start: startDate });
     if (excludeId) qb.andWhere('r.id != :excludeId', { excludeId });
-    return qb.getMany();
+    const rentals = await qb.getMany();
+
+    // 检测同一教室同一日期段是否存在内部排课
+    const scheduleConflicts = await this.scheduleRepo
+      .createQueryBuilder('cs')
+      .where('cs.classroomId = :cid', { cid: classroomId })
+      .andWhere('cs.status = :status', { status: 'active' })
+      .andWhere('cs.startDate <= :end', { end: endDate })
+      .andWhere('cs.endDate >= :start', { start: startDate })
+      .getMany();
+
+    if (scheduleConflicts.length > 0) {
+      throw new ConflictException({
+        message: '该教室在此时间段已有排课',
+        conflicts: scheduleConflicts.map((s) => ({
+          id: s.id,
+          startDate: s.startDate,
+          endDate: s.endDate,
+          tenantName: `[内部排课] ${s.subject}`,
+        })),
+      });
+    }
+
+    return rentals;
   }
 
   async create(dto: CreateRentalDto, userId?: number) {
@@ -120,7 +143,9 @@ export class ClassroomRentalsService {
     }
     const rental = this.repo.create({ ...dto, createdBy: userId, status: 'active' });
     rental.departmentId = classroom.departmentId;
-    return this.repo.save(rental);
+    const saved = await this.repo.save(rental);
+    await this.syncScheduleFromRental(saved, tenant.name);
+    return saved;
   }
 
   async update(id: number, dto: UpdateRentalDto) {
@@ -145,11 +170,19 @@ export class ClassroomRentalsService {
       }
     }
     await this.repo.update(id, dto);
-    return this.findOne(id);
+    const updated = await this.findOne(id);
+    if (dto.status === 'cancelled') {
+      await this.scheduleRepo.delete({ rentalId: id, scheduleType: 'RENTAL' });
+    } else {
+      await this.syncScheduleFromRental(updated);
+    }
+    return updated;
   }
 
   async remove(id: number) {
     const rental = await this.findOne(id);
+    // 同步删除对应排课记录
+    await this.scheduleRepo.delete({ rentalId: id, scheduleType: 'RENTAL' });
     // 同时删除合同文件
     if (rental.contractPath) {
       const full = path.join(this.uploadDir, rental.contractPath);
diff --git a/apps/server/src/schedules/schedules.module.ts b/apps/server/src/schedules/schedules.module.ts
index faadc7e..a3a4624 100644
--- a/apps/server/src/schedules/schedules.module.ts
+++ b/apps/server/src/schedules/schedules.module.ts
@@ -1,6 +1,6 @@
 import { Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
-import { ClassSchedule, Class } from '../entities';
+import { ClassSchedule, Class, ClassroomRental } from '../entities';
 import { SchedulesService } from './schedules.service';
 import { SchedulesController } from './schedules.controller';
 import { OperationLogsModule } from '../operation-logs/operation-logs.module';
@@ -8,7 +8,7 @@ import { NotificationsModule } from '../notifications/notifications.module';
 import { CommonModule } from '../common/common.module';
 
 @Module({
-  imports: [TypeOrmModule.forFeature([ClassSchedule, Class]), OperationLogsModule, NotificationsModule, CommonModule],
+  imports: [TypeOrmModule.forFeature([ClassSchedule, Class, ClassroomRental]), OperationLogsModule, NotificationsModule, CommonModule],
   controllers: [SchedulesController],
   providers: [SchedulesService],
   exports: [SchedulesService],
diff --git a/apps/server/src/schedules/schedules.service.spec.ts b/apps/server/src/schedules/schedules.service.spec.ts
index 3c17c87..df310fd 100644
--- a/apps/server/src/schedules/schedules.service.spec.ts
+++ b/apps/server/src/schedules/schedules.service.spec.ts
@@ -4,6 +4,7 @@ import { ConflictException } from '@nestjs/common';
 import { Repository } from 'typeorm';
 import { SchedulesService } from './schedules.service';
 import { ClassSchedule } from '../entities/class-schedule.entity';
+import { ClassroomRental } from '../entities/classroom-rental.entity';
 import { Class } from '../entities/class.entity';
 import { CampusScope } from '../common/campus-scope';
 
@@ -20,6 +21,7 @@ function mockQueryBuilder<T>(results: T[] = []) {
 describe('SchedulesService — checkConflict', () => {
   let service: SchedulesService;
   let scheduleRepo: jest.Mocked<Pick<Repository<ClassSchedule>, 'createQueryBuilder'>>;
+  let rentalRepo: jest.Mocked<Pick<Repository<ClassroomRental>, 'createQueryBuilder'>>;
 
   beforeEach(async () => {
     const mockRepo = {
@@ -31,19 +33,23 @@ describe('SchedulesService — checkConflict', () => {
         SchedulesService,
         { provide: getRepositoryToken(ClassSchedule), useValue: mockRepo },
         { provide: getRepositoryToken(Class), useValue: { find: jest.fn().mockResolvedValue([]) } },
-        { provide: CampusScope, useValue: { getScopeDepartmentIds: jest.fn().mockResolvedValue(null), filter: jest.fn((w: any) => w) } },
+        { provide: getRepositoryToken(ClassroomRental), useValue: { createQueryBuilder: jest.fn() } },
+        { provide: CampusScope, useValue: { getScopeDepartmentIds: jest.fn().mockResolvedValue(null), filter: jest.fn((w: unknown) => w) } },
       ],
     }).compile();
 
     service = module.get<SchedulesService>(SchedulesService);
     scheduleRepo = module.get(getRepositoryToken(ClassSchedule));
+    rentalRepo = module.get(getRepositoryToken(ClassroomRental));
   });
 
   it('same classroom + same weekday + overlapping times → ConflictException', async () => {
     const qb = mockQueryBuilder<ClassSchedule>([
       { id: 1, subject: '数学', startTime: '08:00', endTime: '10:00' } as ClassSchedule,
     ]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
     (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
 
     await expect(
       service.checkConflict(1, 3, '09:00', '11:00', '2026-03-01', '2026-06-30'),
@@ -52,7 +58,9 @@ describe('SchedulesService — checkConflict', () => {
 
   it('same classroom + same weekday + non-overlapping times → no conflict', async () => {
     const qb = mockQueryBuilder<ClassSchedule>([]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
     (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
 
     await expect(
       service.checkConflict(1, 3, '10:00', '12:00', '2026-03-01', '2026-06-30'),
@@ -61,7 +69,9 @@ describe('SchedulesService — checkConflict', () => {
 
   it('same classroom + same weekday + overlapping times but disjoint date ranges → no conflict', async () => {
     const qb = mockQueryBuilder<ClassSchedule>([]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
     (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
 
     await expect(
       service.checkConflict(1, 3, '09:00', '11:00', '2026-07-01', '2026-08-31'),
@@ -70,7 +80,9 @@ describe('SchedulesService — checkConflict', () => {
 
   it('different classroom → no conflict', async () => {
     const qb = mockQueryBuilder<ClassSchedule>([]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
     (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
 
     await expect(
       service.checkConflict(2, 3, '09:00', '11:00', '2026-03-01', '2026-06-30'),
@@ -79,10 +91,36 @@ describe('SchedulesService — checkConflict', () => {
 
   it('excludes the given schedule id from conflict check', async () => {
     const qb = mockQueryBuilder<ClassSchedule>([]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
     (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
 
     await service.checkConflict(1, 3, '09:00', '11:00', '2026-03-01', '2026-06-30', 42);
 
     expect(qb.andWhere).toHaveBeenCalledWith('cs.id != :excludeId', { excludeId: 42 });
   });
+
+  it('overlapping classroom rental → ConflictException', async () => {
+    const qb = mockQueryBuilder<ClassSchedule>([]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([
+      { id: 10, startDate: '2026-03-01', endDate: '2026-03-31', status: 'active' } as ClassroomRental,
+    ]);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
+
+    await expect(
+      service.checkConflict(1, 3, '09:00', '11:00', '2026-03-01', '2026-06-30'),
+    ).rejects.toThrow(ConflictException);
+  });
+
+  it('cancelled rental does not conflict', async () => {
+    const qb = mockQueryBuilder<ClassSchedule>([]);
+    const rentalQb = mockQueryBuilder<ClassroomRental>([]);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+    (rentalRepo.createQueryBuilder as jest.Mock).mockReturnValue(rentalQb);
+
+    await expect(
+      service.checkConflict(1, 3, '09:00', '11:00', '2026-03-01', '2026-06-30'),
+    ).resolves.toEqual([]);
+  });
 });
diff --git a/apps/server/src/schedules/schedules.service.ts b/apps/server/src/schedules/schedules.service.ts
index c2785fc..ef28da7 100644
--- a/apps/server/src/schedules/schedules.service.ts
+++ b/apps/server/src/schedules/schedules.service.ts
@@ -1,7 +1,7 @@
 import { Injectable, NotFoundException, ConflictException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
-import { ClassSchedule, Class } from '../entities';
+import { ClassSchedule, Class, ClassroomRental } from '../entities';
 import { CampusScope } from '../common/campus-scope';
 import {
   CreateScheduleDto,
@@ -17,6 +17,8 @@ export class SchedulesService {
     private readonly scheduleRepo: Repository<ClassSchedule>,
     private readonly scope: CampusScope,
     @InjectRepository(Class) private readonly classRepo: Repository<Class>,
+    @InjectRepository(ClassroomRental)
+    private readonly rentalRepo: Repository<ClassroomRental>,
   ) {}
 
   async findAll(query: QueryScheduleDto) {
@@ -110,6 +112,22 @@ export class SchedulesService {
         `该时间段与已有排课冲突: ${conflicts.map((c) => `${c.subject}(${c.startTime}-${c.endTime})`).join(', ')}`,
       );
     }
+
+    // 同时检测同一教室在同一日期段是否存在租赁订单（ status != cancelled ）
+    const rentalConflicts = await this.rentalRepo
+      .createQueryBuilder('r')
+      .where('r.classroomId = :classroomId', { classroomId })
+      .andWhere('r.status != :cancelled', { cancelled: 'cancelled' })
+      .andWhere('r.startDate <= :endDate', { endDate })
+      .andWhere('r.endDate >= :startDate', { startDate })
+      .getMany();
+
+    if (rentalConflicts.length > 0) {
+      throw new ConflictException(
+        `该教室在 ${rentalConflicts.map((r) => `${r.startDate}~${r.endDate}`).join('、')} 已被租赁，无法排课`,
+      );
+    }
+
     return conflicts;
   }