diff --git a/trading_system/strategy.py b/trading_system/strategy.py
index 3e93712..bd00400 100644
--- a/trading_system/strategy.py
+++ b/trading_system/strategy.py
@@ -103,26 +103,28 @@ class TradingStrategy:
                     # 使用技术指标判断交易信号（高胜率策略）
                     trade_signal = await self._analyze_trade_signal(symbol_info)
                     
-                    # 记录交易信号到数据库
-                    try:
-                        import sys
-                        from pathlib import Path
-                        project_root = Path(__file__).parent.parent
-                        backend_path = project_root / 'backend'
-                        if backend_path.exists():
-                            sys.path.insert(0, str(backend_path))
-                            from database.models import TradingSignal
-                            TradingSignal.create(
-                                symbol=symbol,
-                                signal_direction=trade_signal.get('direction', ''),
-                                signal_strength=trade_signal.get('strength', 0),
-                                signal_reason=trade_signal.get('reason', ''),
-                                rsi=symbol_info.get('rsi'),
-                                macd_histogram=symbol_info.get('macd', {}).get('histogram') if symbol_info.get('macd') else None,
-                                market_regime=symbol_info.get('marketRegime')
-                            )
-                    except Exception as e:
-                        logger.debug(f"记录交易信号失败: {e}")
+                    # 记录交易信号到数据库（只有当有明确方向时才记录）
+                    signal_direction = trade_signal.get('direction')
+                    if signal_direction:  # 只有当方向不为空时才记录
+                        try:
+                            import sys
+                            from pathlib import Path
+                            project_root = Path(__file__).parent.parent
+                            backend_path = project_root / 'backend'
+                            if backend_path.exists():
+                                sys.path.insert(0, str(backend_path))
+                                from database.models import TradingSignal
+                                TradingSignal.create(
+                                    symbol=symbol,
+                                    signal_direction=signal_direction,
+                                    signal_strength=trade_signal.get('strength', 0),
+                                    signal_reason=trade_signal.get('reason', ''),
+                                    rsi=symbol_info.get('rsi'),
+                                    macd_histogram=symbol_info.get('macd', {}).get('histogram') if symbol_info.get('macd') else None,
+                                    market_regime=symbol_info.get('marketRegime')
+                                )
+                        except Exception as e:
+                            logger.debug(f"记录交易信号失败: {e}")
                     
                     if not trade_signal['should_trade']:
                         logger.info(