diff --git a/node_api/src/modules/websocket/meeting-redis.service.ts b/node_api/src/modules/websocket/meeting-redis.service.ts
index fb00a0a..0df0925 100644
--- a/node_api/src/modules/websocket/meeting-redis.service.ts
+++ b/node_api/src/modules/websocket/meeting-redis.service.ts
@@ -248,13 +248,19 @@ export class MeetingRedisService {
    * 设置投屏状态
    * @param roomId - 房间 ID
    * @param screenShareOwnerUid - 投屏人短 UID，null 表示停止投屏
+   * @param screenShareActualUid - 投屏的实际声网 UID（可选）
    */
-  async setScreenSharing(roomId: string, screenShareOwnerUid: number | null): Promise<void> {
+  async setScreenSharing(roomId: string, screenShareOwnerUid: number | null, screenShareActualUid?: number | null): Promise<void> {
     const key = `${this.KEY_PREFIX.ROOM_STATE}${roomId}`;
     if (screenShareOwnerUid === null) {
       await this.getClient().hdel(key, 'screenShareOwnerUid');
+      await this.getClient().hdel(key, 'screenShareActualUid');
     } else {
-      await this.getClient().hset(key, { screenShareOwnerUid: String(screenShareOwnerUid) });
+      const data: Record<string, string> = { screenShareOwnerUid: String(screenShareOwnerUid) };
+      if (typeof screenShareActualUid === 'number') {
+        data.screenShareActualUid = String(screenShareActualUid);
+      }
+      await this.getClient().hset(key, data);
       await this.getClient().expire(key, 24 * 60 * 60);
     }
   }
@@ -293,6 +299,7 @@ export class MeetingRedisService {
     classStatus: 'finished' | 'in_class' | 'not_started';
     speakerUid?: number;
     screenShareOwnerUid?: number;
+    screenShareActualUid?: number;
     teacherUid?: number;
     endTimestamp?: number;
   }> {
@@ -301,12 +308,14 @@ export class MeetingRedisService {
     const status = (map?.classStatus as any) || 'not_started';
     const speakerUid = map?.speakerUid ? Number(map.speakerUid) : undefined;
     const screenShareOwnerUid = map?.screenShareOwnerUid ? Number(map.screenShareOwnerUid) : undefined;
+    const screenShareActualUid = map?.screenShareActualUid ? Number(map.screenShareActualUid) : undefined;
     const teacherUid = map?.teacherUid ? Number(map.teacherUid) : undefined;
     const endTimestamp = map?.endTimestamp ? Number(map.endTimestamp) : undefined;
     return {
       classStatus: status,
       ...(Number.isFinite(speakerUid) ? { speakerUid } : {}),
       ...(Number.isFinite(screenShareOwnerUid) ? { screenShareOwnerUid } : {}),
+      ...(Number.isFinite(screenShareActualUid) ? { screenShareActualUid } : {}),
       ...(Number.isFinite(teacherUid) ? { teacherUid } : {}),
       ...(Number.isFinite(endTimestamp) ? { endTimestamp } : {}),
     };
diff --git a/node_api/src/modules/websocket/meeting.websocket.ts b/node_api/src/modules/websocket/meeting.websocket.ts
index 0a7368c..60606fe 100644
--- a/node_api/src/modules/websocket/meeting.websocket.ts
+++ b/node_api/src/modules/websocket/meeting.websocket.ts
@@ -364,6 +364,7 @@ export class MeetingWebSocketGateway implements OnGatewayConnection, OnGatewayDi
           isVideoMuted: userState.isVideoMuted,
           classStatus: roomState.classStatus,
           screenShareOwnerUid: roomState.screenShareOwnerUid,
+          screenShareActualUid: roomState.screenShareActualUid,
           speakerUid,
           teacherUid,
           ...(resolvedEndTimestamp ? { endTimestamp: resolvedEndTimestamp } : {}),
@@ -715,8 +716,8 @@ export class MeetingWebSocketGateway implements OnGatewayConnection, OnGatewayDi
     if (!Number.isFinite(screenUid) || screenUid <= 0) {
       return;
     }
-    // 保存投屏状态到 Redis
-    await this.redisService.setScreenSharing(data.roomId, targetUid);
+    // 保存投屏状态到 Redis（同时保存短 UID 和实际 UID）
+    await this.redisService.setScreenSharing(data.roomId, targetUid, screenUid);
     // 广播给整个房间：有人开始投屏
     this.server?.to(data.roomId).emit('message', { type: 'sev_start_screen_share', data: { fromRoomId: data.roomId, targetUid, screenUid } });
     this.log(`创建者开始投屏：roomId=${data.roomId}, shortUid=${targetUid}, screenUid=${screenUid}`);
diff --git a/node_api/src/modules/websocket/types.ts b/node_api/src/modules/websocket/types.ts
index 8316ef3..8542c93 100644
--- a/node_api/src/modules/websocket/types.ts
+++ b/node_api/src/modules/websocket/types.ts
@@ -163,6 +163,8 @@ export interface MeetingJoinRoomSuccessData {
   classStatus: 'finished' | 'in_class' | 'not_started';
   /** 投屏状态：正在投屏的用户短 UID，undefined表示无人投屏 */
   screenShareOwnerUid?: number;
+  /** 投屏的实际声网 UID（仅在有投屏时存在） */
+  screenShareActualUid?: number;
   /** 上台的短 uid，默认为老师的 uid */
   speakerUid: number;
   /** 老师的短 uid */
diff --git a/src/views/meeting/meeting-room/meeting-room-student.vue b/src/views/meeting/meeting-room/meeting-room-student.vue
index 0a9fcda..29793b5 100644
--- a/src/views/meeting/meeting-room/meeting-room-student.vue
+++ b/src/views/meeting/meeting-room/meeting-room-student.vue
@@ -116,6 +116,8 @@
   const speakerUid = ref<number | string | null>(null);
   /** 投屏用户 ID */
   const screenShareOwnerUid = ref<number | string | null>(null);
+  /** 投屏的实际声网 UID（由后端返回） */
+  const screenShareActualUid = ref<number | null>(null);
   const studentPrimaryOverrideUid = ref<number | string | null>(null);
 
   const meeting = useAgoraMeeting(
@@ -176,19 +178,6 @@
 
   const isTeacherDualStream = computed(() => Boolean(teacherUid.value && screenShareOwnerUid.value));
 
-  /** 根据投屏用户短 UID 计算实际的声网 UID */
-  function calculateScreenActualUid(uid: number): number {
-    return uid + 1000000;
-  }
-
-  /** 获取当前投屏的实际声网 UID（如果有） */
-  const screenShareActualUid = computed<number | null>(() => {
-    if (typeof screenShareOwnerUid.value === 'number' && screenShareOwnerUid.value > 0) {
-      return calculateScreenActualUid(screenShareOwnerUid.value);
-    }
-    return null;
-  });
-
   const teacherPreferredPrimaryUid = computed<number | string | null>(() => {
     // 如果有投屏，优先使用投屏的实际 UID
     if (screenShareActualUid.value) {
@@ -554,9 +543,11 @@
       }
       case 'sev_start_screen_share': {
         const targetUid = packet.data?.targetUid;
+        const screenUid = packet.data?.screenUid;
         if (typeof targetUid === 'number') {
           screenShareOwnerUid.value = targetUid;
-          console.log('[屏幕共享] 收到开始投屏消息:', { targetUid, calculatedActualUid: calculateScreenActualUid(targetUid) });
+          screenShareActualUid.value = typeof screenUid === 'number' ? screenUid : null;
+          console.log('[屏幕共享] 收到开始投屏消息:', { targetUid, screenUid });
           Toast.info?.(`用户 ${targetUid} 开始投屏`);
         }
         break;
@@ -565,6 +556,7 @@
         const targetUid = packet.data?.targetUid;
         if (typeof targetUid === 'number') {
           screenShareOwnerUid.value = null;
+          screenShareActualUid.value = null;
           console.log('[屏幕共享] 收到停止投屏消息:', { targetUid });
           Toast.info?.(`用户 ${targetUid} 停止投屏`);
         }
@@ -656,6 +648,9 @@
       if (typeof roomData.screenShareOwnerUid === 'number') {
         screenShareOwnerUid.value = roomData.screenShareOwnerUid;
       }
+      if (typeof roomData.screenShareActualUid === 'number') {
+        screenShareActualUid.value = roomData.screenShareActualUid;
+      }
       if (classStatus.value === 'in_class') {
         await meeting.initAndJoin(roomData);
         // ✅ 加入后先检查是否有已存在的远程用户
diff --git a/src/views/meeting/meeting-room/types.ts b/src/views/meeting/meeting-room/types.ts
index 8583ff2..7406d86 100644
--- a/src/views/meeting/meeting-room/types.ts
+++ b/src/views/meeting/meeting-room/types.ts
@@ -262,6 +262,8 @@ export interface OnJoinRoomData {
   classStatus?: ClassStatus;
   /** 投屏状态：正在投屏的用户短 UID，undefined表示无人投屏 */
   screenShareOwnerUid?: number;
+  /** 投屏的实际声网 UID（仅在有投屏时存在） */
+  screenShareActualUid?: number;
   /** 主讲人短 UID（默认等于 teacherUid） */
   speakerUid: number;
   /** 老师短 UID */