diff --git a/trading/realtime_trader.py b/trading/realtime_trader.py
index dc70b56..4d795fb 100644
--- a/trading/realtime_trader.py
+++ b/trading/realtime_trader.py
@@ -217,12 +217,32 @@ class RealtimeTrader:
                     logger.error(f"Error loading {symbol} signal: {e}")
 
         # 向后兼容: 使用旧格式的 latest_signal.json
-        if not signals and self.signal_file.exists():
+        # 注意: 只分配给信号中指定的币种，或者根据价格推断币种
+        if self.signal_file.exists():
             try:
                 with open(self.signal_file, 'r') as f:
                     data = json.load(f)
-                    first_symbol = self.symbols[0] if self.symbols else 'BTCUSDT'
-                    signals[first_symbol] = data
+
+                    # 尝试从信号中获取币种
+                    signal_symbol = data.get('symbol')
+
+                    # 如果没有明确指定，尝试从价格推断
+                    if not signal_symbol:
+                        signal_price = (data.get('aggregated_signal', {})
+                                       .get('levels', {})
+                                       .get('current_price', 0))
+                        if signal_price:
+                            # BTC 价格通常 > $10,000，ETH 价格通常 < $10,000
+                            if signal_price > 10000:
+                                signal_symbol = 'BTCUSDT'
+                            elif signal_price > 100:
+                                signal_symbol = 'ETHUSDT'
+
+                    # 只有当推断出的币种在我们的列表中，且还没有信号时才使用
+                    if signal_symbol and signal_symbol in self.symbols and signal_symbol not in signals:
+                        signals[signal_symbol] = data
+                        logger.info(f"Loaded legacy signal for {signal_symbol}")
+
             except Exception as e:
                 logger.error(f"Error loading legacy signal: {e}")