diff --git a/apps/admin/src/pages/Classrooms/index.tsx b/apps/admin/src/pages/Classrooms/index.tsx
index bd8485c..731a6b9 100644
--- a/apps/admin/src/pages/Classrooms/index.tsx
+++ b/apps/admin/src/pages/Classrooms/index.tsx
@@ -12,6 +12,7 @@ import {
   Tag,
   Popconfirm,
   Upload,
+  Tooltip,
 } from 'antd';
 import {
   PlusOutlined,
@@ -25,9 +26,18 @@ import PermissionButton from '../../components/PermissionButton';
 
 const statusMap: Record<string, { text: string; color: string }> = {
   available: { text: '可用', color: 'green' },
+  in_use: { text: '使用中', color: 'blue' },
+  maintenance: { text: '维护中', color: 'orange' },
   archived: { text: '已归档', color: '#999' },
 };
 
+interface CurrentUsage {
+  type: 'schedule' | 'rental';
+  title: string;
+  startTime: string;
+  endTime: string;
+}
+
 const typeColor: Record<string, string> = {
   大: 'volcano',
   次大: 'geekblue',
@@ -142,7 +152,14 @@ const ClassroomsPage: React.FC = () => {
     {
       title: '状态',
       dataIndex: 'status',
-      render: (s: string) => <Tag color={statusMap[s]?.color}>{statusMap[s]?.text || s}</Tag>,
+      render: (s: string, record: { currentUsage?: CurrentUsage | null }) => {
+        const effectiveStatus = record.currentUsage ? 'in_use' : s;
+        return (
+          <Tooltip title={record.currentUsage ? `${record.currentUsage.title} (${record.currentUsage.startTime}-${record.currentUsage.endTime})` : undefined}>
+            <Tag color={statusMap[effectiveStatus]?.color}>{statusMap[effectiveStatus]?.text || s}</Tag>
+          </Tooltip>
+        );
+      },
     },
     {
       title: '操作',
diff --git a/apps/server/src/classrooms/classrooms.service.ts b/apps/server/src/classrooms/classrooms.service.ts
index 2789acb..992604b 100644
--- a/apps/server/src/classrooms/classrooms.service.ts
+++ b/apps/server/src/classrooms/classrooms.service.ts
@@ -22,13 +22,16 @@ export class ClassroomsService {
     if (query?.building) where.building = query.building;
     if (query?.roomType) where.roomType = query.roomType;
     if (!query?.includeArchived) where.status = Not('archived');
-    return this.repo.find({ where: await this.scope.filter(where), order: { building: 'ASC', name: 'ASC' } });
+    const list = await this.repo.find({ where: await this.scope.filter(where), order: { building: 'ASC', name: 'ASC' } });
+    const usageMap = await this.getCurrentUsageForClassrooms(list.map((c) => c.id));
+    return list.map((c) => ({ ...c, currentUsage: usageMap.get(c.id) ?? null }));
   }
 
   async findOne(id: number) {
     const cls = await this.repo.findOne({ where: { id } });
     if (!cls) throw new NotFoundException('教室不存在');
-    return cls;
+    const usageMap = await this.getCurrentUsageForClassrooms([id]);
+    return { ...cls, currentUsage: usageMap.get(id) ?? null };
   }
 
   async create(dto: CreateClassroomDto) {
@@ -47,16 +50,83 @@ export class ClassroomsService {
 
   async remove(id: number) {
     await this.findOne(id);
-    await this.repo.update(id, { status: 'archived' } as any);
+    await this.repo.update(id, { status: 'archived' });
     return { message: '已归档' };
   }
 
   async restore(id: number) {
     await this.findOne(id);
-    await this.repo.update(id, { status: 'available' } as any);
+    await this.repo.update(id, { status: 'available' });
     return this.repo.findOne({ where: { id } });
   }
 
+  private async getCurrentUsageForClassrooms(classroomIds: number[]): Promise<Map<number, { type: 'schedule' | 'rental'; title: string; startTime: string; endTime: string }>> {
+    const result = new Map<number, { type: 'schedule' | 'rental'; title: string; startTime: string; endTime: string }>();
+    if (classroomIds.length === 0) return result;
+
+    const now = new Date();
+    const todayStr = now.toISOString().slice(0, 10);
+    const currentTime = now.toTimeString().slice(0, 5);
+    const weekDay = now.getDay() || 7;
+
+    const schedules = await this.scheduleRepo
+      .createQueryBuilder('s')
+      .leftJoin('Class', 'c', 'c.id = s.classId')
+      .select('s.classroomId', 'classroomId')
+      .addSelect('s.startTime', 'startTime')
+      .addSelect('s.endTime', 'endTime')
+      .addSelect('s.subject', 'subject')
+      .addSelect('c.name', 'className')
+      .where('s.classroomId IN (:...ids)', { ids: classroomIds })
+      .andWhere('s.status = :active', { active: 'active' })
+      .andWhere('s.scheduleType = :type', { type: 'INTERNAL' })
+      .andWhere('s.startDate <= :today', { today: todayStr })
+      .andWhere('s.endDate >= :today', { today: todayStr })
+      .andWhere('s.weekDay = :weekDay', { weekDay })
+      .andWhere('s.startTime <= :currentTime', { currentTime })
+      .andWhere('s.endTime >= :currentTime', { currentTime })
+      .getRawMany();
+
+    for (const s of schedules) {
+      const classroomId = Number(s.classroomId);
+      if (!result.has(classroomId)) {
+        result.set(classroomId, {
+          type: 'schedule',
+          title: `${s.className || ''} ${s.subject || ''}`.trim() || '内部课程',
+          startTime: String(s.startTime),
+          endTime: String(s.endTime),
+        });
+      }
+    }
+
+    const rentals = await this.rentalRepo
+      .createQueryBuilder('r')
+      .leftJoin('Tenant', 't', 't.id = r.tenantId')
+      .select('r.classroomId', 'classroomId')
+      .addSelect('r.startDate', 'startDate')
+      .addSelect('r.endDate', 'endDate')
+      .addSelect('t.name', 'tenantName')
+      .where('r.classroomId IN (:...ids)', { ids: classroomIds })
+      .andWhere('r.status != :cancelled', { cancelled: 'cancelled' })
+      .andWhere('r.startDate <= :today', { today: todayStr })
+      .andWhere('r.endDate >= :today', { today: todayStr })
+      .getRawMany();
+
+    for (const r of rentals) {
+      const classroomId = Number(r.classroomId);
+      if (!result.has(classroomId)) {
+        result.set(classroomId, {
+          type: 'rental',
+          title: r.tenantName ? `${r.tenantName} 租赁` : '外部租赁',
+          startTime: '00:00',
+          endTime: '23:59',
+        });
+      }
+    }
+
+    return result;
+  }
+
   async batchImport(
     rows: {
       name: string;