diff --git a/src/xt_trader.py b/src/xt_trader.py
index 4843a8b..8a14295 100644
--- a/src/xt_trader.py
+++ b/src/xt_trader.py
@@ -127,7 +127,8 @@ class XtTrader:
                     "traded_time": t.traded_time,
                     "traded_price": t.traded_price,
                     "traded_volume": t.traded_volume,
-                    "traded_amount": t.traded_amount
+                    "traded_amount": t.traded_amount,
+                    "trade_type": "buy" if t.order_type == xtconstant.STOCK_BUY else "sell"
                 } for t in trades
             ]
         return []