diff --git a/sanguo_trader/qmt_gateway_client.py b/sanguo_trader/qmt_gateway_client.py
index 761ec37..850592c 100644
--- a/sanguo_trader/qmt_gateway_client.py
+++ b/sanguo_trader/qmt_gateway_client.py
@@ -164,9 +164,14 @@ class QmtGatewayClient:
         try:
             from vnpy.trader.object import CancelRequest
             oid = str(order_id)
-            if oid.startswith("QMT."):      # vt_orderid(QMT.184246#1)→ remark(184246#1)
-                oid = oid[4:]                # vnpy_qmt td.orders 按 remark 建 key
-            self._exec.gateway.cancel_order(CancelRequest(orderid=oid))
+            vt = oid if oid.startswith("QMT.") else f"QMT.{oid}"
+            o = self._exec.orders.get(vt)
+            if o is None:
+                return {"ok": False, "error": f"order {oid} 不在缓存（gateway 未收到该单事件）"}
+            remark = vt[4:]   # vt_orderid(QMT.184246#1)→ remark(184246#1)，vnpy_qmt 按 remark 建 key
+            # vnpy 4.4.0 的 CancelRequest 必填 (orderid, symbol, exchange)，缺 symbol/exchange 会 TypeError
+            self._exec.gateway.cancel_order(
+                CancelRequest(orderid=remark, symbol=o.symbol, exchange=o.exchange))
             return {"ok": True, "order_id": order_id}
         except Exception as e:  # noqa: BLE001
             logger.warning("QmtGatewayClient.cancel_order 失败 %s: %s", order_id, e)