diff --git a/backend/app/crypto_agent/crypto_agent.py b/backend/app/crypto_agent/crypto_agent.py
index 54e3e3c..48fc605 100644
--- a/backend/app/crypto_agent/crypto_agent.py
+++ b/backend/app/crypto_agent/crypto_agent.py
@@ -12,7 +12,6 @@ from app.services.binance_service import binance_service
 from app.services.feishu_service import get_feishu_service
 from app.services.telegram_service import get_telegram_service
 from app.services.paper_trading_service import get_paper_trading_service
-from app.services.price_monitor_service import get_price_monitor_service
 from app.services.signal_database_service import get_signal_db_service
 from app.crypto_agent.llm_signal_analyzer import LLMSignalAnalyzer
 
@@ -47,11 +46,8 @@ class CryptoAgent:
         self.paper_trading_enabled = self.settings.paper_trading_enabled
         if self.paper_trading_enabled:
             self.paper_trading = get_paper_trading_service()
-            self.price_monitor = get_price_monitor_service()
-            self.price_monitor.add_price_callback(self._on_price_update)
         else:
             self.paper_trading = None
-            self.price_monitor = None
 
         # 状态管理
         self.last_signals: Dict[str, Dict[str, Any]] = {}
@@ -206,19 +202,10 @@ class CryptoAgent:
             logger.info(f"   模拟交易: 已启用")
         logger.info("=" * 60 + "\n")
 
-        # 启动价格监控（轮询模式）
-        if self.paper_trading_enabled and self.symbols:
-            try:
-                from app.services.price_monitor_service import get_price_monitor_service
-                self.price_monitor = get_price_monitor_service()
-
-                for symbol in self.symbols:
-                    self.price_monitor.subscribe_symbol(symbol)
-                    self.price_monitor.add_price_callback(self._on_price_update)
-
-                logger.info(f"已启动轮询模式价格监控: {', '.join(self.symbols)}")
-            except Exception as e:
-                logger.error(f"价格监控启动失败: {e}")
+        # 注意：不再启动独立的价格监控
+        # 价格监控由 main.py 中的 price_monitor_loop 统一处理，避免重复检查
+        if self.paper_trading_enabled:
+            logger.info(f"模拟交易已启用（由后台统一监控）")
 
         # 发送启动通知
         await self.feishu.send_text(
@@ -259,11 +246,6 @@ class CryptoAgent:
     def stop(self):
         """停止运行"""
         self.running = False
-
-        # 停止轮询价格监控
-        if hasattr(self, 'price_monitor') and self.price_monitor:
-            self.price_monitor.stop()
-
         logger.info("加密货币智能体已停止")
 
     async def analyze_symbol(self, symbol: str):
diff --git a/backend/app/services/paper_trading_service.py b/backend/app/services/paper_trading_service.py
index c7a5d5b..587bf6a 100644
--- a/backend/app/services/paper_trading_service.py
+++ b/backend/app/services/paper_trading_service.py
@@ -96,12 +96,21 @@ class PaperTradingService:
 
             # 使用 make_transient 将对象从会话中分离，使其成为独立对象
             from sqlalchemy.orm import make_transient
+            loaded_count = 0
+            skipped_count = 0
             for order in orders:
+                # 跳过异常订单：OPEN 状态但 filled_price 为 0 或 None
+                if order.status == OrderStatus.OPEN and (not order.filled_price or order.filled_price <= 0):
+                    logger.warning(f"跳过异常订单 {order.order_id} | {order.symbol} | 状态: {order.status.value} | filled_price: {order.filled_price}")
+                    skipped_count += 1
+                    continue
+
                 db.expunge(order)  # 从会话中移除
                 make_transient(order)  # 使对象独立
                 self.active_orders[order.order_id] = order
+                loaded_count += 1
 
-            logger.info(f"已加载 {len(orders)} 个活跃订单")
+            logger.info(f"已加载 {loaded_count} 个活跃订单 (跳过 {skipped_count} 个异常订单)")
         except Exception as e:
             logger.error(f"加载活跃订单失败: {e}")
         finally:
@@ -470,6 +479,11 @@ class PaperTradingService:
 
     def _check_order_trigger(self, order: PaperOrder, current_price: float) -> Optional[Dict[str, Any]]:
         """检查单个订单是否触发"""
+        # 防御性检查：如果 filled_price 为 0 或 None，说明订单未正确激活，跳过检查
+        if not order.filled_price or order.filled_price <= 0:
+            logger.warning(f"订单 {order.order_id} 的成交价无效: {order.filled_price}，跳过止盈止损检查")
+            return None
+
         triggered = False
         new_status = None
         exit_price = current_price
@@ -518,6 +532,11 @@ class PaperTradingService:
                 logger.error(f"数据库中未找到订单: {order.order_id}")
                 return None
 
+            # 防御性检查：如果 filled_price 为 0 或 None，无法计算盈亏
+            if not db_order.filled_price or db_order.filled_price <= 0:
+                logger.error(f"订单 {db_order.order_id} 的成交价无效: {db_order.filled_price}，无法平仓")
+                return None
+
             # 计算盈亏
             if db_order.side == OrderSide.LONG:
                 pnl_percent = ((exit_price - db_order.filled_price) / db_order.filled_price) * 100