diff --git a/src/master/testTaskCtrler.py b/src/master/testTaskCtrler.py
index 907703b..1aa5932 100644
--- a/src/master/testTaskCtrler.py
+++ b/src/master/testTaskCtrler.py
@@ -11,7 +11,7 @@ def run():
     stub = rpc_pb2_grpc.WorkerStub(channel)
 
     comm = rpc_pb2.Command(commandLine="echo \"s\" | awk '{print \"test\\n\\\"\"}' > test.txt;cat test.txt", packagePath="/root", envVars={'test1':'10','test2':'20'}) # | awk '{print \"test\\\"\\n\"}'
-    paras = rpc_pb2.Parameters(command=comm, stderrRedirectPath="tmp/", stdoutRedirectPath="tmp/")
+    paras = rpc_pb2.Parameters(command=comm, stderrRedirectPath="/root/nfs/test1/test2/", stdoutRedirectPath="")
 
     img = rpc_pb2.Image(name="base", type=rpc_pb2.Image.BASE, owner="docklet")
     inst = rpc_pb2.Instance(cpu=2, memory=2000, disk=500, gpu=0)
diff --git a/src/worker/taskcontroller.py b/src/worker/taskcontroller.py
index 1716eb6..174f1ce 100755
--- a/src/worker/taskcontroller.py
+++ b/src/worker/taskcontroller.py
@@ -91,6 +91,9 @@ class TaskController(rpc_pb2_grpc.WorkerServicer):
         lxcname = '%s-batch-%s-%s' % (username,taskid,str(instanceid))
         instance_type =  request.cluster.instance
         outpath = [request.parameters.stdoutRedirectPath,request.parameters.stderrRedirectPath]
+        for i in range(len(outpath)):
+            if outpath[i] == "":
+                outpath[i] = "/root/nfs/"
 
         # acquire ip
         [status, ip] = self.acquire_ip()
@@ -152,20 +155,35 @@ class TaskController(rpc_pb2_grpc.WorkerServicer):
 
         return rpc_pb2.Reply(status=rpc_pb2.Reply.ACCEPTED,message="")
 
-    def write_output(self,content,path):
-        dirpath = path[:path.rfind("/")]
-        if not os.path.isdir(dirpath):
-            logger.info("Output directory doesn't exist. Create (%s)" % dirpath)
-            os.makedirs(dirpath)
+    def write_output(self,lxcname,tmpfilename,content,lxcfspath,filepath):
         try:
-            outfile = open(path,"w")
+            outfile = open(lxcfspath+"/root/output_tmp.txt","w")
             outfile.write(content.decode(encoding="utf-8"))
             outfile.close()
         except Exception as err:
             logger.error(traceback.format_exc())
-            logger.error("Fail to write to path(%s)" % path)
-        else:
-            logger.info("Succeed to writing to %s" % path)
+            msg = "Fail to write to path(%s)" % (lxcfspath+"/root/output_tmp.txt")
+            logger.error(msg)
+            return [False,msg]
+        logger.info("Succeed to writing to %s" % (lxcfspath+"/root/output_tmp.txt"))
+
+        cmd = "lxc-attach -n " + lxcname + " -- mv %s %s"
+        ret = subprocess.run(cmd % ("/root/output_tmp.txt","/root/nfs/"+tmpfilename),stdout=subprocess.PIPE,stderr=subprocess.STDOUT, shell=True)
+        if ret.returncode != 0:
+            msg = "Fail to move output_tmp.txt to nfs/%s" % tmpfilename
+            logger.error(msg)
+            return [False,msg]
+        logger.info("Succeed to moving output_tmp to nfs/%s" % tmpfilename)
+
+        if "/root/nfs/"+tmpfilename == filepath:
+            return [True,""]
+        ret = subprocess.run(cmd % ("/root/nfs/"+tmpfilename,filepath),stdout=subprocess.PIPE,stderr=subprocess.STDOUT, shell=True)
+        if ret.returncode != 0:
+            msg = ret.stdout.decode(encoding="utf-8")
+            logger.error(msg)
+            return [False,msg]
+        logger.info("Succeed to moving nfs/%s to %s" % (tmpfilename,filepath))
+        return [True,""]
 
     def excute_task(self,taskid,instanceid,envs,lxcname,pkgpath,command,outpath,ip):
         lxcfspath = "/var/lib/lxc/"+lxcname+"/rootfs/"
@@ -187,12 +205,14 @@ class TaskController(rpc_pb2_grpc.WorkerServicer):
             logger.info('run task with command - %s' % cmd)
             ret = subprocess.run(cmd,stdout=subprocess.PIPE,stderr=subprocess.PIPE, shell=True)
             logger.info(ret)
+            stdoutname = str(taskid)+"-"+str(instanceid)+"-stdout.txt"
+            stderrname = str(taskid)+"-"+str(instanceid)+"-stderr.txt"
             if outpath[0][-1] == "/":
-                outpath[0] += "stdout.txt"
+                outpath[0] += stdoutname
             if outpath[1][-1] == "/":
-                outpath[1] += "stderr.txt"
-            self.write_output(ret.stdout,lxcfspath+outpath[0])
-            self.write_output(ret.stderr,lxcfspath+outpath[1])
+                outpath[1] += stderrname
+            [success,msg] = self.write_output(lxcname,stdoutname,ret.stdout,lxcfspath,outpath[0])
+            [success,msg] = self.write_output(lxcname,stderrname,ret.stderr,lxcfspath,outpath[1])
             if ret.returncode == 0:
                 #call master rpc function to tell the taskmgr
                 pass