diff --git a/backend/app/services/paper_trading_service.py b/backend/app/services/paper_trading_service.py
index 7552db6..7b0ece9 100644
--- a/backend/app/services/paper_trading_service.py
+++ b/backend/app/services/paper_trading_service.py
@@ -455,17 +455,17 @@ class PaperTradingService:
             total_count = db.query(PaperOrder).count()
             active_count = len(self.active_orders)
 
-            # 删除所有订单
-            db.query(PaperOrder).delete()
+            # 删除所有订单（包括活跃和历史订单）
+            deleted = db.query(PaperOrder).delete(synchronize_session='fetch')
             db.commit()
 
             # 清空内存缓存
             self.active_orders.clear()
 
-            logger.info(f"模拟交易数据已重置，删除 {total_count} 条订单")
+            logger.info(f"模拟交易数据已重置，删除 {deleted} 条订单（总计 {total_count} 条）")
 
             return {
-                'deleted_count': total_count,
+                'deleted_count': deleted,
                 'active_orders_cleared': active_count
             }
         except Exception as e: