diff --git a/main.py b/main.py
index be17c44..0c7bbfe 100644
--- a/main.py
+++ b/main.py
@@ -3,6 +3,7 @@ import numpy as np
 import urllib.request
 from datetime import datetime
 import time
+import os
 recent_blog=[]
 recent_cloud=[]
 recent_code=[]
@@ -19,6 +20,7 @@ yellow=(0x00,0xcc,0xff)
 light_green=(0x33,0xff,0xcc)
 green=(0x00,0xcc,0x00)
 imgpath="/tmp/uptime-graph/"
+
 def update_history(history,recent):
     average=0
     for i in recent:
@@ -61,10 +63,11 @@ def testConnect(url):
     return (status_code,delay)
 
 if __name__=="__main__":
-    lastminute=-1
+    if not os.path.exists(imgpath):#如果路径不存在
+        os.makedirs(imgpath)
     while True:
-        if datetime.now().second==0 and datetime.now().minute!=lastminute:
-        # if True:
+        time.sleep(0.5)
+        if datetime.now().second==0:
             time.sleep(1)
             (status_code,delay)=testConnect("https://blog.clf3.org")
             print(status_code,end=" ")
@@ -80,8 +83,7 @@ if __name__=="__main__":
                 recent_blog=[]
                 recent_blog.append(delay)
 
-        elif datetime.now().second==10 and datetime.now().minute!=lastminute:
-        # if True:
+        elif datetime.now().second==10:
             time.sleep(1)
             (status_code,delay)=testConnect("https://cloud.clf3.org")
             print(status_code,end=" ")
@@ -97,7 +99,7 @@ if __name__=="__main__":
                 recent_cloud=[]
                 recent_cloud.append(delay)
  
-        elif datetime.now().second==20 and datetime.now().minute!=lastminute:
+        elif datetime.now().second==20:
         # if True:
             time.sleep(1)
             (status_code,delay)=testConnect("https://code.clf3.org")
@@ -114,7 +116,7 @@ if __name__=="__main__":
                 recent_code=[]
                 recent_code.append(delay)
 
-        elif datetime.now().second==30 and datetime.now().minute!=lastminute:
+        elif datetime.now().second==30:
         # if True:
             time.sleep(1)
             (status_code,delay)=testConnect("https://git.clf3.org")