diff --git a/vnpy/app/cta_strategy/engine.py b/vnpy/app/cta_strategy/engine.py
index db6c5add..311981f1 100644
--- a/vnpy/app/cta_strategy/engine.py
+++ b/vnpy/app/cta_strategy/engine.py
@@ -667,6 +667,14 @@ class CtaEngine(BaseEngine):
         Start a strategy.
         """
         strategy = self.strategies[strategy_name]
+        if not strategy.inited:
+            self.write_log(f"策略{strategy.strategy_name}启动失败，请先初始化")
+            return
+
+        if strategy.trading:
+            self.write_log(f"{strategy_name}已经启动，请勿重复操作")
+            return
+
         self.call_strategy_func(strategy, strategy.on_start)
         strategy.trading = True
 
@@ -677,9 +685,19 @@ class CtaEngine(BaseEngine):
         Stop a strategy.
         """
         strategy = self.strategies[strategy_name]
+        if not strategy.trading:
+            return
+
+        # Call on_stop function of the strategy
         self.call_strategy_func(strategy, strategy.on_stop)
+
+        # Change trading status of strategy to False
         strategy.trading = False
 
+        # Cancel all orders of the strategy
+        self.cancel_all(strategy)
+
+        # Update GUI
         self.put_strategy_event(strategy)
 
     def edit_strategy(self, strategy_name: str, setting: dict):
@@ -696,11 +714,15 @@ class CtaEngine(BaseEngine):
         """
         Remove a strategy.
         """
+        strategy = self.strategies[strategy_name]
+        if strategy.trading:
+            self.write_log(f"策略{strategy.strategy_name}移除失败，请先停止")
+            return
+
         # Remove setting
         self.remove_strategy_setting(strategy_name)
 
         # Remove from symbol strategy map
-        strategy = self.strategies[strategy_name]
         strategies = self.symbol_strategy_map[strategy.vt_symbol]
         strategies.remove(strategy)
 
@@ -710,11 +732,14 @@ class CtaEngine(BaseEngine):
 
             # Remove vt_orderid strategy map
             for vt_orderid in vt_orderids:
-                self.orderid_strategy_map.pop(vt_orderid)
+                if vt_orderid in self.orderid_strategy_map:
+                    self.orderid_strategy_map.pop(vt_orderid)
 
         # Remove from strategies
         self.strategies.pop(strategy_name)
 
+        return True
+
     def load_strategy_class(self):
         """
         Load strategy class from source code.
diff --git a/vnpy/app/cta_strategy/template.py b/vnpy/app/cta_strategy/template.py
index 35c9818a..e4f309ff 100644
--- a/vnpy/app/cta_strategy/template.py
+++ b/vnpy/app/cta_strategy/template.py
@@ -230,13 +230,15 @@ class CtaTemplate(ABC):
         """
         Put an strategy data event for ui update.
         """
-        self.cta_engine.put_strategy_event(self)
+        if self.inited:
+            self.cta_engine.put_strategy_event(self)
 
     def send_email(self, msg):
         """
         Send email to default receiver.
         """
-        self.cta_engine.send_email(msg, self)
+        if self.inited:
+            self.cta_engine.send_email(msg, self)
 
     def sync_data(self):
         """
@@ -309,9 +311,10 @@ class TargetPosTemplate(CtaTemplate):
         """
         Callback of new order data update.
         """
-        if order.status == Status.ALLTRADED or order.status == Status.CANCELLED:
-            if order.vt_orderid in self.vt_orderids:
-                self.vt_orderids.remove(order.vt_orderid)
+        vt_orderid = order.vt_orderid
+
+        if not order.is_active() and vt_orderid in self.vt_orderids:
+            self.vt_orderids.remove(vt_orderid)
 
     def set_target_pos(self, target_pos):
         """"""
diff --git a/vnpy/app/cta_strategy/ui/widget.py b/vnpy/app/cta_strategy/ui/widget.py
index e4f2df1e..f7ba697d 100644
--- a/vnpy/app/cta_strategy/ui/widget.py
+++ b/vnpy/app/cta_strategy/ui/widget.py
@@ -239,8 +239,6 @@ class StrategyManager(QtWidgets.QFrame):
 
     def edit_strategy(self):
         """"""
-        # vt_symbol = self._data["vt_symbol"]
-        # class_name = self._data["class_name"]
         strategy_name = self._data["strategy_name"]
 
         parameters = self.cta_engine.get_strategy_parameters(strategy_name)
@@ -253,8 +251,11 @@ class StrategyManager(QtWidgets.QFrame):
 
     def remove_strategy(self):
         """"""
-        self.cta_engine.remove_strategy(self.strategy_name)
-        self.cta_manager.remove_strategy(self.strategy_name)
+        result = self.cta_engine.remove_strategy(self.strategy_name)
+
+        # Only remove strategy gui manager if it has been removed from engine
+        if result:
+            self.cta_manager.remove_strategy(self.strategy_name)
 
 
 class DataMonitor(QtWidgets.QTableWidget):