diff --git a/src/simulation/simulation_trader.py b/src/simulation/simulation_trader.py
index 17d8998..62ac137 100644
--- a/src/simulation/simulation_trader.py
+++ b/src/simulation/simulation_trader.py
@@ -108,30 +108,32 @@ class SimulationTrader(BaseTrader):
         # 此处简化处理，在实际情况中应该计算所有持仓的市值
         self.sim_balance["total"] = self.sim_balance["cash"]
 
-    def cancel(self, order_id, strategy_name="default_strategy"):
+    def cancel(self, order_id):
         message = f"模拟撤单 - 委托号: {order_id}"
         self.logger.info(message)
-        position_manager = self.get_position_manager(strategy_name)
-
-        if order_id in position_manager.pending_orders:
-            position_manager.update_order_status(order_id, 0, ORDER_STATUS_CANCELLED)
-            return {"order_id": "order_id", "message": message, "success": True}
-        else:
-            return {"order_id": None, "message": "订单不存在", "success": False}
+        position_managers = self.get_all_position_managers()
+        for position_manager in position_managers.values():
+            if order_id in position_manager.pending_orders:
+                position_manager.update_order_status(order_id, 0, ORDER_STATUS_CANCELLED)
+                return {"order_id": "order_id", "message": message, "success": True}
+            else:
+                return {"order_id": None, "message": "订单不存在", "success": False}
 
     def get_balance(self):
         message = "模拟交易：查询余额"
         self.logger.info(message)
         return self.sim_balance
 
-    def get_positions(self, strategy_name="default_strategy"):
+    def get_positions(self):
         message = "模拟交易：查询持仓"
         self.logger.info(message)
 
-        position_manager = self.get_position_manager(strategy_name)
-        postions = position_manager.get_positions()
+        position_managers = self.get_all_position_managers()
+        positions = {}
+        for position_manager in position_managers.values():
+            positions.update(position_manager.get_positions())
         # convert to json list
-        return [position.to_dict() for position in postions.values()]
+        return [position.to_dict() for position in positions.values()]
 
     def get_today_trades(self):
         message = "模拟交易：查询今日成交"
diff --git a/src/trade_server.py b/src/trade_server.py
index 5435351..5f294d4 100644
--- a/src/trade_server.py
+++ b/src/trade_server.py
@@ -154,7 +154,7 @@ def buy():
                 strategy_name, code, ORDER_DIRECTION_BUY, amount, price
             )
         else:
-            result = get_trader().buy(code, price, amount)
+            result = get_trader().buy(code, price, amount, strategy_name)
 
         if result.get("success"):
             logger.info(f"买入成功: {result}")
@@ -211,7 +211,7 @@ def sell():
                 strategy_name, code, ORDER_DIRECTION_SELL, amount, price
             )
         else:
-            result = get_trader().sell(code, price, amount)
+            result = get_trader().sell(code, price, amount, strategy_name)
 
         if result.get("success"):
             logger.info(f"卖出成功: {result}")
@@ -268,7 +268,6 @@ def get_positions():
         logger.error(f"Error processing positions request: {str(e)}")
         abort(500, description="Internal server error")
 
-
 @app.route("/yu/todaytrades", methods=["GET"])
 def get_today_trades():
     """Get the today's trades of the account."""