diff --git a/09.CompositePattern/2.Code/main.cpp b/09.CompositePattern/2.Code/main.cpp
index e6a5b5e..6b516fa 100644
--- a/09.CompositePattern/2.Code/main.cpp
+++ b/09.CompositePattern/2.Code/main.cpp
@@ -56,5 +56,18 @@ int main()
 	delete office7;
 	delete office8;
 
+	head = nullptr;
+	sichuanBranch = nullptr;
+	cdBranch = nullptr;
+	myBranch = nullptr;
+	office1 = nullptr;
+	office2 = nullptr;
+	office3 = nullptr;
+	office4 = nullptr;
+	office5 = nullptr;
+	office6 = nullptr;
+	office7 = nullptr;
+	office8 = nullptr;
+
 	return 0;
 }
\ No newline at end of file
diff --git a/12.FlyweightPattern/2.Code/main.cpp b/12.FlyweightPattern/2.Code/main.cpp
index db04f09..9840371 100644
--- a/12.FlyweightPattern/2.Code/main.cpp
+++ b/12.FlyweightPattern/2.Code/main.cpp
@@ -35,6 +35,11 @@ int main()
 	delete device2;
 	delete device3;
 	delete device4;
+	factory = nullptr;
+	device1 = nullptr;
+	device2 = nullptr;
+	device3 = nullptr;
+	device4 = nullptr;
 	
 	system("pause");
 	return 0;
diff --git a/14.ChainOfResponsibility/2.Code/main.cpp b/14.ChainOfResponsibility/2.Code/main.cpp
index 499b5ea..86a61e8 100644
--- a/14.ChainOfResponsibility/2.Code/main.cpp
+++ b/14.ChainOfResponsibility/2.Code/main.cpp
@@ -37,6 +37,14 @@ int main()
 	delete bill2;
 	delete bill3;
 	delete bill4;
+	zuzhang = nullptr;
+	bingge = nullptr;
+	chunzong = nullptr;
+	laoban = nullptr;
+	bill1 = nullptr;
+	bill2 = nullptr;
+	bill3 = nullptr;
+	bill4 = nullptr;
 
 	system("pause");
 	return 0;