diff --git a/f7/udplog.py b/f7/udplog.py
index 9329b64..9a3a07f 100644
--- a/f7/udplog.py
+++ b/f7/udplog.py
@@ -1,11 +1,14 @@
 # -*- coding: utf-8 -*-
 
+import os
 import time
 import datetime
 import traceback
 import _thread
 import threading
 
+import q7
+
 class _LocalLogNode:
     def __init__(self, msg):
         self.msg = msg
@@ -21,6 +24,7 @@ class _UdpLog:
         return cls._instance
 
     def __init__(self):
+        self._logDir = ''
         self._topNode = None
         self._botNode = None
         self._workNode = None
@@ -29,6 +33,11 @@ class _UdpLog:
     def init(self):
         _thread.start_new_thread(self._saveToFile, ())
 
+    def setLogDirAndCreate(self, logdir):
+        if not os.path.exists(logdir):
+            os.makedirs(logdir)
+        self._logDir = logdir
+
     def unInit(self):
         pass
 
@@ -72,9 +81,9 @@ class _UdpLog:
                     finally:
                         self._msgLock.release()
                 if self._workNode:
-                    filename = datetime.datetime.now().strftime('log%Y-%m-%d.log')
+                    filename = datetime.datetime.now().strftime('log_' + str(os.getpid()) + '_%Y%m%d.log')
                     try:
-                        with open(os.path.join(LOG_DIR, filename), 'a') as f:
+                        with open(os.path.join(self._logDir, filename), 'a') as f:
                             while self._workNode:
                                 nextNode = self._workNode.nextNode
                                 f.write(self._workNode.msg + '\r\n')
diff --git a/test/app.py b/test/app.py
index 4afb760..0ec8cbe 100644
--- a/test/app.py
+++ b/test/app.py
@@ -8,4 +8,6 @@ sys.path.append('..')
 import f7.udplog
 
 f7.udplog.instance().init()
-time.sleep(5)
+f7.udplog.instance().setLogDirAndCreate('/data/logs/f7test/logs')
+f7.udplog.instance().info('start')
+time.sleep(15)