diff --git a/apps/admin/src/pages/Schedules/index.tsx b/apps/admin/src/pages/Schedules/index.tsx
index 42547cf..c37e756 100644
--- a/apps/admin/src/pages/Schedules/index.tsx
+++ b/apps/admin/src/pages/Schedules/index.tsx
@@ -947,6 +947,19 @@ const SchedulesPage: React.FC = () => {
               />
             </Form.Item>
 
+            <Form.Item
+              name="notes"
+              label="备注"
+              rules={[{ max: 500, message: '备注不能超过500字' }]}
+            >
+              <Input.TextArea
+                rows={3}
+                maxLength={500}
+                showCount
+                placeholder="可填写排课说明、设备需求或临时调整原因"
+              />
+            </Form.Item>
+
             <Form.Item
               name="timeRange"
               label="上课时段"
diff --git a/apps/admin/src/pages/Schedules/schedule-form.integration.test.ts b/apps/admin/src/pages/Schedules/schedule-form.integration.test.ts
index d87ec6e..021b143 100644
--- a/apps/admin/src/pages/Schedules/schedule-form.integration.test.ts
+++ b/apps/admin/src/pages/Schedules/schedule-form.integration.test.ts
@@ -15,10 +15,12 @@ describe('schedule edit form mapping', () => {
       endTime: '18:00',
       startDate: '2026-07-01',
       endDate: '2026-07-31',
+      notes: '需要投影设备',
     });
 
     expect(values.classroomId).toBe(1);
     expect(values.weekDay).toBe(5);
+    expect(values.notes).toBe('需要投影设备');
     expect(values.timeRange.map((item) => item.format('HH:mm'))).toEqual(['14:00', '18:00']);
     expect(values.dateRange.map((item) => item.format('YYYY-MM-DD'))).toEqual([
       '2026-07-01',
@@ -36,6 +38,7 @@ describe('schedule edit form mapping', () => {
         teacherId: 4,
         timeRange: [dayjs('2026-01-01 13:30'), dayjs('2026-01-01 17:20')],
         dateRange: [dayjs('2026-08-01'), dayjs('2026-08-31')],
+        notes: '  临时调整教室  ',
       }),
     ).toEqual({
       classId: 1,
@@ -47,6 +50,24 @@ describe('schedule edit form mapping', () => {
       endTime: '17:20',
       startDate: '2026-08-01',
       endDate: '2026-08-31',
+      notes: '临时调整教室',
     });
   });
 });
+
+
+describe('schedule notes normalization', () => {
+  it('omits whitespace-only notes from the payload', () => {
+    expect(
+      buildSchedulePayload({
+        classId: 1,
+        classroomId: 2,
+        weekDay: 6,
+        subject: '作文',
+        timeRange: [dayjs('2026-01-01 13:30'), dayjs('2026-01-01 17:20')],
+        dateRange: [dayjs('2026-08-01'), dayjs('2026-08-31')],
+        notes: '   ',
+      }).notes,
+    ).toBeUndefined();
+  });
+});
diff --git a/apps/admin/src/pages/Schedules/schedule-form.ts b/apps/admin/src/pages/Schedules/schedule-form.ts
index 42d1d7f..dc4560c 100644
--- a/apps/admin/src/pages/Schedules/schedule-form.ts
+++ b/apps/admin/src/pages/Schedules/schedule-form.ts
@@ -6,6 +6,7 @@ export interface ScheduleFormValues {
   weekDay: number;
   subject: string;
   teacherId?: number;
+  notes?: string;
   timeRange: [Dayjs, Dayjs];
   dateRange: [Dayjs, Dayjs];
 }
@@ -17,6 +18,7 @@ export interface EditableSchedule {
   weekDay: number;
   subject: string;
   teacherId: number | null;
+  notes?: string | null;
   startTime: string;
   endTime: string;
   startDate: string;
@@ -29,6 +31,7 @@ export const scheduleToFormValues = (schedule: EditableSchedule): ScheduleFormVa
   weekDay: schedule.weekDay,
   subject: schedule.subject,
   teacherId: schedule.teacherId ?? undefined,
+  notes: schedule.notes ?? undefined,
   timeRange: [dayjs(`2000-01-01 ${schedule.startTime}`), dayjs(`2000-01-01 ${schedule.endTime}`)],
   dateRange: [dayjs(schedule.startDate), dayjs(schedule.endDate)],
 });
@@ -39,6 +42,7 @@ export const buildSchedulePayload = (values: ScheduleFormValues) => ({
   weekDay: values.weekDay,
   subject: values.subject,
   teacherId: values.teacherId,
+  notes: values.notes?.trim() || undefined,
   startTime: values.timeRange[0].format('HH:mm'),
   endTime: values.timeRange[1].format('HH:mm'),
   startDate: values.dateRange[0].format('YYYY-MM-DD'),
diff --git a/apps/server/src/schedules/dto/schedule.dto.spec.ts b/apps/server/src/schedules/dto/schedule.dto.spec.ts
new file mode 100644
index 0000000..5e85269
--- /dev/null
+++ b/apps/server/src/schedules/dto/schedule.dto.spec.ts
@@ -0,0 +1,29 @@
+import 'reflect-metadata';
+import { validate } from 'class-validator';
+import { CreateScheduleDto, UpdateScheduleDto } from './schedule.dto';
+
+const createSchedule = (notes: string) =>
+  Object.assign(new CreateScheduleDto(), {
+    classId: 1,
+    classroomId: 2,
+    weekDay: 1,
+    startTime: '09:00',
+    endTime: '10:00',
+    startDate: '2026-07-01',
+    endDate: '2026-07-31',
+    subject: '语文',
+    notes,
+  });
+
+describe('schedule notes validation', () => {
+  it('rejects notes longer than 500 characters when creating', async () => {
+    const errors = await validate(createSchedule('a'.repeat(501)));
+    expect(errors.some((error) => error.property === 'notes')).toBe(true);
+  });
+
+  it('rejects notes longer than 500 characters when updating', async () => {
+    const dto = Object.assign(new UpdateScheduleDto(), { notes: 'a'.repeat(501) });
+    const errors = await validate(dto);
+    expect(errors.some((error) => error.property === 'notes')).toBe(true);
+  });
+});
diff --git a/apps/server/src/schedules/dto/schedule.dto.ts b/apps/server/src/schedules/dto/schedule.dto.ts
index 3d6869f..016560a 100644
--- a/apps/server/src/schedules/dto/schedule.dto.ts
+++ b/apps/server/src/schedules/dto/schedule.dto.ts
@@ -7,6 +7,7 @@ import {
   Matches,
   Min,
   Max,
+  MaxLength,
 } from 'class-validator';
 import { Type } from 'class-transformer';
 
@@ -59,6 +60,7 @@ export class CreateScheduleDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(500)
   notes?: string;
 
   @IsOptional()
@@ -115,6 +117,7 @@ export class UpdateScheduleDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(500)
   notes?: string;
 }