diff --git a/src/job_manager.go b/src/job_manager.go
index efc554f..7eee09b 100644
--- a/src/job_manager.go
+++ b/src/job_manager.go
@@ -16,13 +16,16 @@ type JobManager struct {
 	jobStatus  JobStatus
 	resources  []NodeStatus
 	killedFlag bool
+	isRunning  bool
+	network    string
 }
 
 func (jm *JobManager) start() {
 	log.Info("start job ", jm.job.Name, time.Now())
+	jm.isRunning = false
 	jm.jobStatus = JobStatus{Name: jm.job.Name, tasks: map[string]TaskStatus{}}
 
-	network := jm.scheduler.AcquireNetwork()
+	jm.network = jm.scheduler.AcquireNetwork()
 
 	InstanceJobHistoryLogger().submitJob(jm.job)
 
@@ -82,7 +85,7 @@ func (jm *JobManager) start() {
 	}
 	if !jm.killedFlag {
 		jm.scheduler.UpdateProgress(jm.job, Running)
-
+		jm.isRunning = true
 		log.Info("ready to run job ", jm.job.Name, time.Now())
 	}
 
@@ -116,7 +119,7 @@ func (jm *JobManager) start() {
 			v.Set("gpus", strings.Join(GPUs, ","))
 			v.Set("mem_limit", strconv.Itoa(jm.job.Tasks[i].Memory)+"m")
 			v.Set("cpu_limit", strconv.Itoa(jm.job.Tasks[i].NumberCPU))
-			v.Set("network", network)
+			v.Set("network", jm.network)
 			v.Set("should_wait", "1")
 			v.Set("output_dir", "/tmp/")
 			v.Set("hdfs_address", "http://192.168.100.104:50070/")
@@ -160,17 +163,12 @@ func (jm *JobManager) start() {
 		}
 		time.Sleep(time.Second * 10)
 	}
-
-	jm.scheduler.ReleaseNetwork(network)
-
-	if !jm.killedFlag {
-		jm.scheduler.UpdateProgress(jm.job, Finished)
-		log.Info("finish job ", jm.job.Name)
-	}
-	log.Info("JobMaster exited ", jm.job.Name)
 }
 
 func (jm *JobManager) checkStatus() bool {
+	if !jm.isRunning {
+		return false
+	}
 	res := jm.status()
 	flag := false
 	onlyPS := true
@@ -227,6 +225,17 @@ func (jm *JobManager) checkStatus() bool {
 		log.Info("Only PS is running, stop ", jm.job.Name)
 		jm.killedFlag = false
 	}
+
+	if !flag {
+		jm.isRunning = false
+		jm.scheduler.ReleaseNetwork(jm.network)
+
+		if !jm.killedFlag {
+			jm.scheduler.UpdateProgress(jm.job, Finished)
+			log.Info("finish job ", jm.job.Name)
+		}
+		log.Info("JobMaster exited ", jm.job.Name)
+	}
 	return flag
 }