diff --git a/src/main/java/com/webgame/webgamebackend/service/impl/GameServiceImpl.java b/src/main/java/com/webgame/webgamebackend/service/impl/GameServiceImpl.java
index 37f0f18..11ffe33 100644
--- a/src/main/java/com/webgame/webgamebackend/service/impl/GameServiceImpl.java
+++ b/src/main/java/com/webgame/webgamebackend/service/impl/GameServiceImpl.java
@@ -6,6 +6,8 @@ import com.webgame.webgamebackend.common.exception.BusinessException;
 import com.webgame.webgamebackend.common.exception.ErrorCode;
 import com.webgame.webgamebackend.entities.*;
 import com.webgame.webgamebackend.repository.*;
+import com.webgame.webgamebackend.common.event.SseEventPublisher;
+import com.webgame.webgamebackend.common.event.SseEventType;
 import com.webgame.webgamebackend.service.GameService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -32,6 +34,7 @@ public class GameServiceImpl implements GameService {
     private final RoomPlayerRepository roomPlayerRepository;
     private final UserRepository userRepository;
     private final BCryptPasswordEncoder passwordEncoder;
+    private final SseEventPublisher sseEventPublisher;
 
     @Override
     public GameListResponse getGameList() {
@@ -144,6 +147,10 @@ public class GameServiceImpl implements GameService {
         RoomItemResponse roomResponse = RoomItemResponse.from(room, players, gameConfig.getIcon(), creatorName);
 
         log.info("[游戏服务] 创建房间成功, roomId={}, gameId={}, creatorId={}", room.getId(), request.gameId(), creatorId);
+
+        // 通知所有在线用户：新房间创建
+        sseEventPublisher.broadcast(SseEventType.ROOM_CREATED, roomResponse);
+
         return new CreateRoomResponse(roomResponse);
     }
 
@@ -206,7 +213,11 @@ public class GameServiceImpl implements GameService {
         String creatorName = getNickname(room.getCreatorId());
 
         log.info("[游戏服务] 玩家加入房间, roomId={}, userId={}", room.getId(), userId);
-        return RoomItemResponse.from(room, players, gameConfig.getIcon(), creatorName);
+
+        RoomItemResponse response = RoomItemResponse.from(room, players, gameConfig.getIcon(), creatorName);
+        // 通知所有在线用户：房间信息更新
+        sseEventPublisher.broadcast(SseEventType.ROOM_UPDATED, response);
+        return response;
     }
 
     @Override
@@ -221,6 +232,7 @@ public class GameServiceImpl implements GameService {
 
         roomPlayerRepository.delete(player);
 
+        // remaining 需要在后面的 SSE 推送中用到，提取到方法级
         List<RoomPlayerEntity> remaining = roomPlayerRepository.findByRoomId(roomId);
 
         if (remaining.isEmpty()) {
@@ -240,6 +252,20 @@ public class GameServiceImpl implements GameService {
         }
 
         log.info("[游戏服务] 玩家离开房间, roomId={}, userId={}", roomId, userId);
+
+        // 获取剩余玩家重新组装房间信息并推送事件
+        if (remaining.isEmpty()) {
+            sseEventPublisher.broadcast(SseEventType.ROOM_REMOVED,
+                    Map.of("roomId", roomId));
+        } else {
+            List<RoomPlayerResponse> players = buildRoomPlayers(roomId);
+            GameConfigEntity gameConfig = gameConfigRepository.findByGameId(room.getGameId())
+                    .orElse(null);
+            String icon = gameConfig != null ? gameConfig.getIcon() : "";
+            String creatorName = getNickname(room.getCreatorId());
+            RoomItemResponse response = RoomItemResponse.from(room, players, icon, creatorName);
+            sseEventPublisher.broadcast(SseEventType.ROOM_UPDATED, response);
+        }
     }
 
     @Override
@@ -264,6 +290,18 @@ public class GameServiceImpl implements GameService {
 
         roomPlayerRepository.delete(target);
         log.info("[游戏服务] 房主踢出玩家, roomId={}, targetUserId={}", roomId, targetUserId);
+
+        // 通知被踢玩家
+        sseEventPublisher.sendTo(targetUserId, SseEventType.KICKED,
+                Map.of("roomId", roomId));
+        // 通知房间内其他玩家：房间更新
+        List<RoomPlayerResponse> players = buildRoomPlayers(roomId);
+        GameConfigEntity gameConfig = gameConfigRepository.findByGameId(room.getGameId())
+                .orElse(null);
+        String icon = gameConfig != null ? gameConfig.getIcon() : "";
+        String creatorName = getNickname(room.getCreatorId());
+        RoomItemResponse response = RoomItemResponse.from(room, players, icon, creatorName);
+        sseEventPublisher.broadcast(SseEventType.ROOM_UPDATED, response);
     }
 
     @Override
@@ -284,6 +322,16 @@ public class GameServiceImpl implements GameService {
         roomPlayerRepository.save(player);
 
         log.info("[游戏服务] 玩家{}准备, roomId={}, userId={}", newStatus ? "" : "取消", roomId, userId);
+
+        // 通知房间更新
+        List<RoomPlayerResponse> players = buildRoomPlayers(roomId);
+        GameConfigEntity gameConfig = gameConfigRepository.findByGameId(room.getGameId())
+                .orElse(null);
+        String icon = gameConfig != null ? gameConfig.getIcon() : "";
+        String creatorName = getNickname(room.getCreatorId());
+        RoomItemResponse response = RoomItemResponse.from(room, players, icon, creatorName);
+        sseEventPublisher.broadcast(SseEventType.ROOM_UPDATED, response);
+
         return newStatus;
     }
 
@@ -344,6 +392,37 @@ public class GameServiceImpl implements GameService {
         gameRoomRepository.save(room);
 
         log.info("[游戏服务] 游戏开始, roomId={}, 参与人数={}, 底注={}", roomId, players.size(), room.getStakes());
+
+        // 通知房间状态更新
+        List<RoomPlayerResponse> allPlayers = buildRoomPlayers(roomId);
+        GameConfigEntity gameConfig = gameConfigRepository.findByGameId(room.getGameId())
+                .orElse(null);
+        String icon = gameConfig != null ? gameConfig.getIcon() : "";
+        String creatorName = getNickname(room.getCreatorId());
+        RoomItemResponse response = RoomItemResponse.from(room, allPlayers, icon, creatorName);
+        sseEventPublisher.broadcast(SseEventType.ROOM_UPDATED, response);
+
+        // 通知房间内每个玩家游戏已开始
+        for (RoomPlayerEntity player : players) {
+            sseEventPublisher.sendTo(player.getUserId(), SseEventType.GAME_STARTED,
+                    Map.of("roomId", roomId));
+        }
+
+        // 通知余额变动（房主已在前面扣除了底注）
+        ownerUser = userRepository.findByAccountId(ownerId).orElse(null);
+        if (ownerUser != null) {
+            sseEventPublisher.sendTo(ownerId, SseEventType.BALANCE_CHG,
+                    Map.of("balance", ownerUser.getBalance(), "delta", -room.getStakes()));
+        }
+        for (RoomPlayerEntity player : players) {
+            if (!player.getUserId().equals(ownerId)) {
+                UserEntity user = userRepository.findByAccountId(player.getUserId()).orElse(null);
+                if (user != null) {
+                    sseEventPublisher.sendTo(player.getUserId(), SseEventType.BALANCE_CHG,
+                            Map.of("balance", user.getBalance(), "delta", -room.getStakes()));
+                }
+            }
+        }
     }
 
     // ==================== 私有辅助方法 ====================