diff --git a/src/simulation/simulation_trader.py b/src/simulation/simulation_trader.py
index 30e9d22..af1ee0a 100644
--- a/src/simulation/simulation_trader.py
+++ b/src/simulation/simulation_trader.py
@@ -72,12 +72,13 @@ class SimulationTrader(BaseTrader):
         self.logger.info(message)
 
         # 获取策略持仓
-        strategy_positions = self.position_manager.get_positions(strategy_name)
+        position_manager = self.get_position_manager(strategy_name)
+        strategy_positions = position_manager.get_positions()
 
         # 检查持仓是否足够
         if (
             code not in strategy_positions
-            or strategy_positions[code]["closeable_amount"] < amount
+            or strategy_positions[code].closeable_amount < amount
         ):
             message = f"模拟卖出失败 - 代码: {code}, 可用数量不足"
             self.logger.warning(message)
@@ -88,7 +89,6 @@ class SimulationTrader(BaseTrader):
         self.sim_balance["cash"] += proceeds
 
         # 更新持仓管理器
-        position_manager = self.get_position_manager(strategy_name)
         position_manager.update_position(
             strategy_name, code, ORDER_DIRECTION_SELL, amount
         )