diff --git a/backend/internal/ws/handler.go b/backend/internal/ws/handler.go
index e91ed4e..6b3500e 100644
--- a/backend/internal/ws/handler.go
+++ b/backend/internal/ws/handler.go
@@ -15,12 +15,12 @@ import (
 	"github.com/hhs/camtalk/internal/auth"
 	"github.com/hhs/camtalk/internal/config"
 	"github.com/hhs/camtalk/internal/errors"
-	"github.com/hhs/camtalk/internal/logger"
 	"github.com/hhs/camtalk/internal/models"
 	"github.com/hhs/camtalk/internal/orchestrator"
 	"github.com/hhs/camtalk/internal/ratelimit"
 	"github.com/hhs/camtalk/internal/session"
 	"github.com/hhs/camtalk/internal/store"
+	"github.com/hhs/camtalk/internal/trace"
 )
 
 // newUpgrader 根据配置创建 WebSocket upgrader。
@@ -134,9 +134,20 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 		}
 	}
 
+	// 生成连接级 trace ID（整个 WebSocket 生命周期使用）
+	ctx := c.Request.Context()
+	traceID := trace.GetTraceID(ctx)
+	if traceID == "" {
+		// 如果 REST 中间件未生成（不应发生），fallback 生成
+		traceID = trace.GenerateTraceID()
+		ctx = trace.WithTraceID(ctx, traceID)
+		c.Request = c.Request.WithContext(ctx)
+	}
+
 	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
 	if err != nil {
-		logger.Log.Errorw("websocket upgrade failed", "error", err)
+		log := trace.FromContext(ctx)
+		log.Errorw("websocket upgrade failed", "error", err)
 		return
 	}
 	defer conn.Close()
@@ -145,13 +156,17 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 	var sessionID string
 	if conversationID != "" {
 		sessionID = conversationID
-		logger.Log.Infow("resuming conversation", "session", sessionID, "user_id", userID)
+		ctx = trace.WithSessionID(ctx, sessionID)
+		log := trace.FromContext(ctx)
+		log.Infow("resuming conversation", "user_id", userID)
 	} else {
 		sessionID, err = sessionMgr.Create(context.Background(), userID, models.DefaultConfig())
 		if err != nil {
-			logger.Log.Errorw("create session failed", "error", err)
+			log := trace.FromContext(ctx)
+			log.Errorw("create session failed", "error", err)
 			return
 		}
+		ctx = trace.WithSessionID(ctx, sessionID)
 	}
 
 	client := &Client{
@@ -168,7 +183,8 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 		SessionID:     sessionID,
 		ServerVersion: version,
 	})
-	logger.Log.Infow("client connected", "session", sessionID, "user_id", userID, "username", username)
+	log := trace.FromContext(ctx)
+	log.Infow("client connected", "user_id", userID, "username", username)
 
 	// 心跳检测
 	lastPong := time.Now()
@@ -186,7 +202,8 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 			select {
 			case <-ticker.C:
 				if time.Since(lastPong) > heartbeatTimeout {
-					logger.Log.Warnw("heartbeat timeout", "session", sessionID)
+					log := trace.FromContext(ctx)
+					log.Warnw("heartbeat timeout")
 					conn.Close()
 					return
 				}
@@ -201,7 +218,8 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 		_, message, err := conn.ReadMessage()
 		if err != nil {
 			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseNormalClosure) {
-				logger.Log.Warnw("ws read error", "error", err)
+				log := trace.FromContext(ctx)
+				log.Warnw("ws read error", "error", err)
 			}
 			break
 		}
@@ -226,14 +244,18 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 				errors.SendWSError(client, errors.CodeInvalidMessage, msg.RequestID, err)
 				continue
 			}
-			logger.Log.Infow("query received", "session", sessionID, "request", msg.RequestID)
+
+			// 注入 request ID 到 context
+			queryCtx := trace.WithRequestID(ctx, msg.RequestID)
+			log := trace.FromContext(queryCtx)
+			log.Infow("query received", "has_image", msg.Image != "", "has_audio", msg.Audio != "")
 
 			// 限流检查
 			if limiter != nil {
 				key := fmt.Sprintf("%s:query", userID)
 				allowed, retryAfter := limiter.Allow(context.Background(), key)
 				if !allowed {
-					logger.Log.Warnw("rate limited", "user_id", userID, "retry_after", retryAfter)
+					log.Warnw("rate limited", "user_id", userID, "retry_after", retryAfter)
 					errors.SendWSError(client, errors.CodeRateLimited, msg.RequestID,
 						fmt.Errorf("rate limited, retry after %s", retryAfter.Round(time.Second)))
 					continue
@@ -242,16 +264,16 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 
 			// 刷新会话 TTL
 			if err := client.sessionMgr.Touch(context.Background(), sessionID); err != nil {
-				logger.Log.Warnw("touch session failed", "session", sessionID, "error", err)
+				log.Warnw("touch session failed", "error", err)
 			}
 
 			// 标记活跃请求
 			if err := client.sessionMgr.SetActiveRequest(context.Background(), sessionID, msg.RequestID); err != nil {
-				logger.Log.Warnw("set active request failed", "session", sessionID, "error", err)
+				log.Warnw("set active request failed", "error", err)
 			}
 
 			// 创建可取消的 context
-			ctx, cancel := context.WithCancel(context.Background())
+			processCtx, cancel := context.WithCancel(queryCtx)
 			client.mu.Lock()
 			client.cancelFuncs[msg.RequestID] = cancel
 			client.mu.Unlock()
@@ -271,8 +293,9 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 					_ = client.sessionMgr.ClearActiveRequest(context.Background(), sessionID)
 				}()
 
-				if err := client.orchestrator.ProcessQuery(ctx, sessionID, msg, sender); err != nil {
-					logger.Log.Errorw("process query failed", "session", sessionID, "request", msg.RequestID, "error", err)
+				if err := client.orchestrator.ProcessQuery(processCtx, sessionID, msg, sender); err != nil {
+					log := trace.FromContext(processCtx)
+					log.Errorw("process query failed", "error", err)
 				}
 			}()
 
@@ -298,7 +321,8 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 			if msg.Payload.Scenario != nil {
 				scenarioID = *msg.Payload.Scenario
 			}
-			logger.Log.Infow("config updated", "session", sessionID, "scenario", scenarioID)
+			log := trace.FromContext(ctx)
+			log.Infow("config updated", "scenario", scenarioID)
 
 			// 如果切换了情景（非自由对话），返回首句引导
 			if scenarioID != "" && scenarioID != "free_chat" {
@@ -350,7 +374,8 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 			}
 
 		case "interrupt":
-			logger.Log.Infow("interrupt received", "session", sessionID)
+			log := trace.FromContext(ctx)
+			log.Infow("interrupt received")
 
 			// 获取活跃请求 ID 并取消
 			reqID, _ := client.sessionMgr.GetActiveRequestID(context.Background(), sessionID)
@@ -378,12 +403,14 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 	// 取消所有活跃请求
 	client.mu.Lock()
 	for reqID, cancel := range client.cancelFuncs {
-		logger.Log.Infow("canceling active request on disconnect", "session", sessionID, "request", reqID)
+		log := trace.FromContext(ctx)
+		log.Infow("canceling active request on disconnect", "request", reqID)
 		cancel()
 	}
 	client.cancelFuncs = make(map[string]context.CancelFunc)
 	client.mu.Unlock()
 
 	// 断开连接时不销毁会话，让其自然过期（支持重连恢复）
-	logger.Log.Infow("client disconnected", "session", sessionID)
+	log = trace.FromContext(ctx)
+	log.Infow("client disconnected")
 }