diff --git a/backend/app/services/price_monitor_service.py b/backend/app/services/price_monitor_service.py
index 0cca589..67cf467 100644
--- a/backend/app/services/price_monitor_service.py
+++ b/backend/app/services/price_monitor_service.py
@@ -41,18 +41,18 @@ class PriceMonitorService:
         self._poll_interval = 3  # 轮询间隔（秒）
         self._session = requests.Session()
 
-        logger.info("价格监控服务初始化完成（轮询模式）")
+        logger.info(f"[PriceMonitor:{id(self)}] 价格监控服务初始化完成（轮询模式）")
 
     def start(self):
         """启动价格轮询"""
         if self.running:
-            logger.debug("价格监控服务已在运行")
+            logger.debug(f"[PriceMonitor:{id(self)}] 价格监控服务已在运行")
             return
 
         self.running = True
 
         def _poll_loop():
-            logger.info(f"价格轮询已启动，间隔 {self._poll_interval} 秒")
+            logger.info(f"[PriceMonitor:{id(self)}] 价格轮询已启动，间隔 {self._poll_interval} 秒")
             while self.running:
                 try:
                     self._fetch_prices()
@@ -148,14 +148,19 @@ class PriceMonitorService:
         Args:
             symbol: 交易对，如 "BTCUSDT"
         """
+        import traceback
         symbol = symbol.upper()
 
+        # 添加调用栈追踪
+        stack = traceback.extract_stack()
+        caller = stack[-2] if len(stack) >= 2 else None
+
         if symbol in self.subscribed_symbols:
-            logger.debug(f"已订阅 {symbol}")
+            logger.debug(f"[PriceMonitor:{id(self)}] {symbol} 已订阅，跳过 (来自: {caller})")
             return
 
         self.subscribed_symbols.add(symbol)
-        logger.info(f"已订阅 {symbol} 价格更新")
+        logger.info(f"[PriceMonitor:{id(self)}] 已订阅 {symbol} 价格更新 (来自: {caller}，当前订阅: {self.subscribed_symbols})")
 
         # 如果服务未启动，自动启动
         if not self.running: