diff --git a/my_tree.py b/my_tree.py
index 823dbfc..450bea8 100644
--- a/my_tree.py
+++ b/my_tree.py
@@ -12,4 +12,18 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+pen.fd(100)
+pen.right(30)
+pen.fd(50)
+pen.up()
+pen.bk(50)
+pen.down()
+pen.left(60)
+pen.fd(50)
+pen.up()
+pen.bk(50)
+pen.right(30)
+pen.bk(100)
+pen.down() 
+
 turtle.done()