diff --git a/trading_system/binance_client.py b/trading_system/binance_client.py
index c93d8c6..990850b 100644
--- a/trading_system/binance_client.py
+++ b/trading_system/binance_client.py
@@ -1777,6 +1777,9 @@ class BinanceClient:
             if dual is True:
                 retry = dict(params)
                 retry.pop("positionSide", None)
+                # 关键修复：重试时必须清除之前的 timestamp 和 signature
+                retry.pop("timestamp", None)
+                retry.pop("signature", None)
                 logger.debug(f"{symbol} 重试1: 移除 positionSide（对冲模式 -> 单向模式）")
                 retry_order = await self.futures_create_algo_order(retry)
                 if retry_order:
@@ -1785,6 +1788,9 @@ class BinanceClient:
             else:
                 retry = dict(params)
                 retry["positionSide"] = "LONG" if pd == "BUY" else "SHORT"
+                # 关键修复：重试时必须清除之前的 timestamp 和 signature
+                retry.pop("timestamp", None)
+                retry.pop("signature", None)
                 logger.debug(f"{symbol} 重试1: 添加 positionSide={retry['positionSide']}（单向模式 -> 对冲模式）")
                 retry_order = await self.futures_create_algo_order(retry)
                 if retry_order:
@@ -1819,9 +1825,10 @@ class BinanceClient:
                 logger.error(f"  原因: 订单名义价值不足（至少需要 5 USDT）")
             elif error_code == -2022:
                 logger.error(f"  原因: ReduceOnly 订单被拒绝（可能没有持仓或持仓方向不对）")
-            elif "immediately trigger" in error_msg.lower() or "would immediately trigger" in error_msg.lower():
+            elif error_code == -2021 or "immediately trigger" in error_msg.lower() or "would immediately trigger" in error_msg.lower():
                 logger.error(f"  原因: 触发价格会导致立即触发（止损/止盈价不在正确一侧）")
-                logger.error(f"  建议: 检查止损/止盈价格计算是否正确")
+                # 关键修复：将此异常抛出，让上层调用者（如 PositionManager）决定是否立即执行市价平仓
+                raise e
             elif "position" in error_msg.lower():
                 logger.error(f"  原因: 持仓相关问题（可能没有持仓或持仓方向不匹配）")
             
diff --git a/trading_system/position_manager.py b/trading_system/position_manager.py
index 25e7683..51824c5 100644
--- a/trading_system/position_manager.py
+++ b/trading_system/position_manager.py
@@ -1419,7 +1419,33 @@ class PositionManager:
                         working_type="MARK_PRICE",
                     )
             except Exception as e:
+                # 检查是否是 -2021 (立即触发)
+                error_msg = str(e)
+                if "-2021" in error_msg or "immediately trigger" in error_msg:
+                    logger.error(f"{symbol} ⚠️ 止损单会立即触发(-2021)，视为已触发止损，立即执行市价平仓")
+                    await self.close_position(symbol, reason='stop_loss')
+                    return
+
                 logger.warning(f"{symbol} 检查止损触发条件时出错: {e}，继续尝试挂单")
+                try:
+                    sl_order = await self.client.place_trigger_close_position_order(
+                        symbol=symbol,
+                        position_direction=side,
+                        trigger_type="STOP_MARKET",
+                        stop_price=stop_loss,
+                        current_price=current_price,
+                        working_type="MARK_PRICE",
+                    )
+                except Exception as retry_e:
+                    retry_msg = str(retry_e)
+                    if "-2021" in retry_msg or "immediately trigger" in retry_msg:
+                        logger.error(f"{symbol} ⚠️ 重试挂止损单会立即触发(-2021)，立即执行市价平仓")
+                        await self.close_position(symbol, reason='stop_loss')
+                        return
+                    logger.error(f"{symbol} 重试挂止损单失败: {retry_e}")
+                    sl_order = None
+        else:
+            try:
                 sl_order = await self.client.place_trigger_close_position_order(
                     symbol=symbol,
                     position_direction=side,
@@ -1428,15 +1454,14 @@ class PositionManager:
                     current_price=current_price,
                     working_type="MARK_PRICE",
                 )
-        else:
-            sl_order = await self.client.place_trigger_close_position_order(
-                symbol=symbol,
-                position_direction=side,
-                trigger_type="STOP_MARKET",
-                stop_price=stop_loss,
-                current_price=current_price,
-                working_type="MARK_PRICE",
-            )
+            except Exception as e:
+                error_msg = str(e)
+                if "-2021" in error_msg or "immediately trigger" in error_msg:
+                    logger.error(f"{symbol} ⚠️ 止损单会立即触发(-2021)，视为已触发止损，立即执行市价平仓")
+                    await self.close_position(symbol, reason='stop_loss')
+                    return
+                logger.error(f"{symbol} 挂止损单失败: {e}")
+                sl_order = None
         
         if sl_order:
             logger.info(f"{symbol} ✓ 止损单已成功挂到交易所: {sl_order.get('algoId', 'N/A')}")