diff --git a/backend/database/fix_exit_order_id_unique.sql b/backend/database/fix_exit_order_id_unique.sql
new file mode 100644
index 0000000..406484b
--- /dev/null
+++ b/backend/database/fix_exit_order_id_unique.sql
@@ -0,0 +1,50 @@
+-- 修复 exit_order_id 唯一约束问题
+-- 问题：exit_order_id 有 UNIQUE 约束，但在状态同步时，同一个订单可能被多次更新，导致重复键错误
+-- 解决方案：移除 UNIQUE 约束，保留索引以便快速查询
+
+USE `auto_trade_sys`;
+
+-- 1. 删除唯一约束（如果存在）
+-- 注意：MySQL 中，如果字段有 UNIQUE 约束，删除索引会同时删除唯一约束
+-- 先检查是否存在唯一索引
+SET @index_exists = (
+    SELECT COUNT(*) 
+    FROM information_schema.statistics 
+    WHERE table_schema = 'auto_trade_sys' 
+    AND table_name = 'trades' 
+    AND index_name = 'exit_order_id'
+    AND non_unique = 0
+);
+
+-- 如果存在唯一索引，删除它
+SET @sql = IF(@index_exists > 0, 
+    'ALTER TABLE `trades` DROP INDEX `exit_order_id`', 
+    'SELECT "exit_order_id 唯一索引不存在，跳过删除" as message'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 2. 重新添加普通索引（非唯一）
+-- 先检查是否已存在普通索引
+SET @normal_index_exists = (
+    SELECT COUNT(*) 
+    FROM information_schema.statistics 
+    WHERE table_schema = 'auto_trade_sys' 
+    AND table_name = 'trades' 
+    AND index_name = 'idx_exit_order_id'
+);
+
+-- 如果不存在普通索引，添加它
+SET @sql2 = IF(@normal_index_exists = 0, 
+    'ALTER TABLE `trades` ADD INDEX `idx_exit_order_id` (`exit_order_id`)', 
+    'SELECT "idx_exit_order_id 索引已存在，跳过添加" as message'
+);
+PREPARE stmt2 FROM @sql2;
+EXECUTE stmt2;
+DEALLOCATE PREPARE stmt2;
+
+-- 验证：检查表结构
+-- SHOW CREATE TABLE `trades`;
+-- 或者
+-- SHOW INDEX FROM `trades` WHERE Column_name = 'exit_order_id';
diff --git a/backend/database/models.py b/backend/database/models.py
index 1244688..00655c9 100644
--- a/backend/database/models.py
+++ b/backend/database/models.py
@@ -120,16 +120,63 @@ class Trade:
             pnl: 盈亏
             pnl_percent: 盈亏百分比
             exit_order_id: 币安平仓订单号（可选，用于对账）
+        
+        注意：如果 exit_order_id 已存在且属于其他交易记录，会跳过更新 exit_order_id 以避免唯一约束冲突
         """
         exit_time = get_beijing_time()
-        db.execute_update(
-            """UPDATE trades 
-               SET exit_price = %s, exit_time = %s, 
-                   exit_reason = %s, pnl = %s, pnl_percent = %s, status = 'closed',
-                   exit_order_id = %s
-               WHERE id = %s""",
-            (exit_price, exit_time, exit_reason, pnl, pnl_percent, exit_order_id, trade_id)
-        )
+        
+        # 如果提供了 exit_order_id，先检查是否已被其他交易记录使用
+        if exit_order_id is not None:
+            try:
+                existing_trade = Trade.get_by_exit_order_id(exit_order_id)
+                if existing_trade and existing_trade['id'] != trade_id:
+                    # 如果 exit_order_id 已被其他交易记录使用，记录警告但不更新 exit_order_id
+                    logger.warning(
+                        f"交易记录 {trade_id} 的 exit_order_id {exit_order_id} 已被交易记录 {existing_trade['id']} 使用，"
+                        f"跳过更新 exit_order_id，只更新其他字段"
+                    )
+                    # 只更新其他字段，不更新 exit_order_id
+                    db.execute_update(
+                        """UPDATE trades 
+                           SET exit_price = %s, exit_time = %s, 
+                               exit_reason = %s, pnl = %s, pnl_percent = %s, status = 'closed'
+                           WHERE id = %s""",
+                        (exit_price, exit_time, exit_reason, pnl, pnl_percent, trade_id)
+                    )
+                    return
+            except Exception as e:
+                # 如果查询失败，记录警告但继续正常更新
+                logger.warning(f"检查 exit_order_id {exit_order_id} 时出错: {e}，继续正常更新")
+        
+        # 正常更新（包括 exit_order_id）
+        try:
+            db.execute_update(
+                """UPDATE trades 
+                   SET exit_price = %s, exit_time = %s, 
+                       exit_reason = %s, pnl = %s, pnl_percent = %s, status = 'closed',
+                       exit_order_id = %s
+                   WHERE id = %s""",
+                (exit_price, exit_time, exit_reason, pnl, pnl_percent, exit_order_id, trade_id)
+            )
+        except Exception as e:
+            # 如果更新失败（可能是唯一约束冲突），尝试不更新 exit_order_id
+            error_str = str(e)
+            if "Duplicate entry" in error_str and "exit_order_id" in error_str:
+                logger.warning(
+                    f"更新交易记录 {trade_id} 时 exit_order_id {exit_order_id} 唯一约束冲突，"
+                    f"尝试不更新 exit_order_id"
+                )
+                # 只更新其他字段，不更新 exit_order_id
+                db.execute_update(
+                    """UPDATE trades 
+                       SET exit_price = %s, exit_time = %s, 
+                           exit_reason = %s, pnl = %s, pnl_percent = %s, status = 'closed'
+                       WHERE id = %s""",
+                    (exit_price, exit_time, exit_reason, pnl, pnl_percent, trade_id)
+                )
+            else:
+                # 其他错误，重新抛出
+                raise
     
     @staticmethod
     def get_by_entry_order_id(entry_order_id):