diff --git a/examples/vn_trader/run.py b/examples/vn_trader/run.py
index 43b0adcd..f2a58c8e 100644
--- a/examples/vn_trader/run.py
+++ b/examples/vn_trader/run.py
@@ -8,11 +8,11 @@ from vnpy.trader.ui import MainWindow, create_qapp
 # from vnpy.gateway.bitmex import BitmexGateway
 # from vnpy.gateway.futu import FutuGateway
 # from vnpy.gateway.ib import IbGateway
-# from vnpy.gateway.ctp import CtpGateway
+from vnpy.gateway.ctp import CtpGateway
 # from vnpy.gateway.ctptest import CtptestGateway
 # from vnpy.gateway.femas import FemasGateway
 # from vnpy.gateway.tiger import TigerGateway
-from vnpy.gateway.oes import OesGateway
+# from vnpy.gateway.oes import OesGateway
 # from vnpy.gateway.okex import OkexGateway
 # from vnpy.gateway.huobi import HuobiGateway
 # from vnpy.gateway.bitfinex import BitfinexGateway
@@ -43,14 +43,14 @@ def main():
     main_engine = MainEngine(event_engine)
 
     # main_engine.add_gateway(BinanceGateway)
-    # main_engine.add_gateway(CtpGateway)
+    main_engine.add_gateway(CtpGateway)
     # main_engine.add_gateway(CtptestGateway)
     # main_engine.add_gateway(FemasGateway)
     # main_engine.add_gateway(IbGateway)
     # main_engine.add_gateway(FutuGateway)
     # main_engine.add_gateway(BitmexGateway)
     # main_engine.add_gateway(TigerGateway)
-    main_engine.add_gateway(OesGateway)
+    # main_engine.add_gateway(OesGateway)
     # main_engine.add_gateway(OkexGateway)
     # main_engine.add_gateway(HuobiGateway)
     # main_engine.add_gateway(BitfinexGateway)
diff --git a/vnpy/app/cta_strategy/engine.py b/vnpy/app/cta_strategy/engine.py
index 4e94ac2f..bcaf2e6a 100644
--- a/vnpy/app/cta_strategy/engine.py
+++ b/vnpy/app/cta_strategy/engine.py
@@ -581,7 +581,10 @@ class CtaEngine(BaseEngine):
             self.write_log(f"创建策略失败，存在重名{strategy_name}")
             return
 
-        strategy_class = self.classes[class_name]
+        strategy_class = self.classes.get(class_name, None)
+        if not strategy_class:
+            self.write_log(f"创建策略失败，找不到策略类{class_name}")
+            return
 
         strategy = strategy_class(self, strategy_name, vt_symbol, setting)
         self.strategies[strategy_name] = strategy
diff --git a/vnpy/app/cta_strategy/ui/widget.py b/vnpy/app/cta_strategy/ui/widget.py
index 12354487..7e553015 100644
--- a/vnpy/app/cta_strategy/ui/widget.py
+++ b/vnpy/app/cta_strategy/ui/widget.py
@@ -179,7 +179,7 @@ class StrategyManager(QtWidgets.QFrame):
 
     def init_ui(self):
         """"""
-        self.setMaximumHeight(300)
+        self.setFixedHeight(300)
         self.setFrameShape(self.Box)
         self.setLineWidth(1)