diff --git a/vnpy/gateway/ctp/ctp_gateway.py b/vnpy/gateway/ctp/ctp_gateway.py
index c92781b7..2b3eb8c7 100644
--- a/vnpy/gateway/ctp/ctp_gateway.py
+++ b/vnpy/gateway/ctp/ctp_gateway.py
@@ -716,6 +716,7 @@ class CtpTdApi(TdApi):
         
         ctp_req = {
             "InstrumentID": req.symbol,
+            "ExchangeID": req.exchange.value,
             "LimitPrice": req.price,
             "VolumeTotalOriginal": int(req.volume),
             "OrderPriceType": ORDERTYPE_VT2CTP.get(req.type, ""),