diff --git a/src/real/xt_trader.py b/src/real/xt_trader.py
index 1f6fe92..ff8911a 100644
--- a/src/real/xt_trader.py
+++ b/src/real/xt_trader.py
@@ -310,7 +310,13 @@ class XtTrader(BaseTrader):
             return {"error": self.connection_error_message or "交易系统连接失败"}
             
         # 确定价格类型
-        price_type = xtconstant.MARKET_BEST if order_type == 'market' else xtconstant.FIX_PRICE
+        if order_type == 'limit':
+            price_type = xtconstant.FIX_PRICE
+        else:
+            if code.endswith('.SH'):
+                price_type = xtconstant.MARKET_SH_CONVERT_5_CANCEL
+            else:
+                price_type = xtconstant.MARKET_SZ_CONVERT_5_CANCEL
                 
         # 如果是市价单，价格可以设为0
         if price_type != xtconstant.FIX_PRICE:
@@ -326,7 +332,13 @@ class XtTrader(BaseTrader):
             return {"error": self.connection_error_message or "交易系统连接失败"}
             
         # 确定价格类型
-        price_type = xtconstant.MARKET_BEST if order_type == 'market' else xtconstant.FIX_PRICE
+        if order_type == 'limit':
+            price_type = xtconstant.FIX_PRICE
+        else:
+            if code.endswith('.SH'):
+                price_type = xtconstant.MARKET_SH_CONVERT_5_CANCEL
+            else:
+                price_type = xtconstant.MARKET_SZ_CONVERT_5_CANCEL
                 
         # 如果是市价单，价格可以设为0
         if price_type != xtconstant.FIX_PRICE: