diff --git a/my_tree.py b/my_tree.py
index 97e8f99..0abb975 100644
--- a/my_tree.py
+++ b/my_tree.py
@@ -26,6 +26,7 @@ def tree(n):
 
 pen = turtle.Turtle()
 pen.color('sienna')
+pen.speed(9)
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦