diff --git a/15.CommandPattern/2.Code/main.cpp b/15.CommandPattern/2.Code/main.cpp
index 7482798..42dc3f5 100644
--- a/15.CommandPattern/2.Code/main.cpp
+++ b/15.CommandPattern/2.Code/main.cpp
@@ -44,6 +44,14 @@ int main()
 #endif
 
 	printf("\n\n");
+
+	delete button;
+	delete lampCmd;
+	delete fanCmd;
+	delete button2;
+	delete lampCmd2;
+	delete fanCmd2;
+
 	system("pause");
 	return 0;
 }
\ No newline at end of file
diff --git a/16.InterpreterPattern/2.Code/main.cpp b/16.InterpreterPattern/2.Code/main.cpp
index 4ea943f..b69a6e4 100644
--- a/16.InterpreterPattern/2.Code/main.cpp
+++ b/16.InterpreterPattern/2.Code/main.cpp
@@ -33,6 +33,9 @@ int main()
 	handler->setInput(input_13); handler->handle();
 
 	printf("\n\n");
+	delete handler;
+	
 	system("pause");
+
 	return 0;
 }
\ No newline at end of file
diff --git a/17.IteratorPattern/2.Code/main.cpp b/17.IteratorPattern/2.Code/main.cpp
index b91d5b3..d28a86e 100644
--- a/17.IteratorPattern/2.Code/main.cpp
+++ b/17.IteratorPattern/2.Code/main.cpp
@@ -31,5 +31,8 @@ int main()
 
 	printf("\n\n");
 	system("pause");
+
+	delete tv;
+	
 	return 0;
 }
\ No newline at end of file
diff --git a/18.MediatorPattern/2.Code/main.cpp b/18.MediatorPattern/2.Code/main.cpp
index 702346d..8355e63 100644
--- a/18.MediatorPattern/2.Code/main.cpp
+++ b/18.MediatorPattern/2.Code/main.cpp
@@ -34,5 +34,13 @@ int main()
 
 	printf("\n\n");
 	system("pause");
+
+	delete mediator;
+	delete fangdong1;
+	delete fangdong2;
+	delete fangdong3;
+	delete jungle;
+	delete jianmengtu;
+
 	return 0;
 }
\ No newline at end of file
diff --git a/19.MementoPattern/2.Code/MementoPattern/MementoPattern/main.cpp b/19.MementoPattern/2.Code/MementoPattern/MementoPattern/main.cpp
index c3e39f4..bd26773 100644
--- a/19.MementoPattern/2.Code/MementoPattern/MementoPattern/main.cpp
+++ b/19.MementoPattern/2.Code/MementoPattern/MementoPattern/main.cpp
@@ -40,5 +40,9 @@ int main()
 
 	printf("\n\n");
 	system("pause");
+
+	delete Jungle;
+	delete codeVer;
+
 	return 0;
 }
\ No newline at end of file
diff --git a/20.ObserverPattern/2.Code/main.cpp b/20.ObserverPattern/2.Code/main.cpp
index 988458c..c7703ae 100644
--- a/20.ObserverPattern/2.Code/main.cpp
+++ b/20.ObserverPattern/2.Code/main.cpp
@@ -28,5 +28,12 @@ int main()
 
 	printf("\n\n");
 	system("pause");
+
+	delete controller;
+	delete Jungle;
+	delete Single;
+	delete Jianmengtu;
+	delete SillyDog;
+
 	return 0;
 }
\ No newline at end of file