diff --git a/piflow-server/src/main/scala/cn/piflow/api/API.scala b/piflow-server/src/main/scala/cn/piflow/api/API.scala
index 6fcd4bd..059dfc3 100644
--- a/piflow-server/src/main/scala/cn/piflow/api/API.scala
+++ b/piflow-server/src/main/scala/cn/piflow/api/API.scala
@@ -103,31 +103,38 @@ object API {
 
     val countDownLatch = new CountDownLatch(1)
     val launcher = new SparkLauncher
-    val handle =launcher
+
+
+    val sparkLauncher =launcher
       .setAppName(appName)
       .setMaster(PropertyUtil.getPropertyValue("spark.master"))
       .setDeployMode(PropertyUtil.getPropertyValue("spark.deploy.mode"))
       .setAppResource(PropertyUtil.getPropertyValue("piflow.bundle"))
       .setVerbose(true)
-      .setConf("spark.hadoop.yarn.resourcemanager.hostname", PropertyUtil.getPropertyValue("yarn.resourcemanager.hostname"))
-      .setConf("spark.hadoop.yarn.resourcemanager.address", PropertyUtil.getPropertyValue("yarn.resourcemanager.address"))
-      .setConf("spark.yarn.access.namenode", PropertyUtil.getPropertyValue("yarn.access.namenode"))
-      .setConf("spark.yarn.stagingDir", PropertyUtil.getPropertyValue("yarn.stagingDir"))
-      .setConf("spark.yarn.jars", PropertyUtil.getPropertyValue("yarn.jars"))
-      .setConf("spark.jars", PropertyUtil.getPropertyValue("piflow.bundle"))
       .setConf("spark.hive.metastore.uris",PropertyUtil.getPropertyValue("hive.metastore.uris"))
       .setConf("spark.driver.memory", dirverMem)
       .setConf("spark.num.executors",executorNum)
       .setConf("spark.executor.memory", executorMem)
       .setConf("spark.executor.cores",executorCores)
-      //.setConf("spark.cores.max", "4")
-      //.setConf("spark.checkpoint", PropertyUtil.getPropertyValue("checkpoint.path"))
       .addFile(PropertyUtil.getConfigureFile())
       .setMainClass("cn.piflow.api.StartFlowMain")
       .addAppArgs(flowJson.stripMargin)
       //.redirectOutput(stdout)
-      //.redirectError(stderr)
-      .startApplication( new SparkAppHandle.Listener {
+
+
+
+    if(PropertyUtil.getPropertyValue("yarn.resourcemanager.hostname") != null)
+      sparkLauncher.setConf("spark.hadoop.yarn.resourcemanager.hostname", PropertyUtil.getPropertyValue("yarn.resourcemanager.hostname"))
+    if(PropertyUtil.getPropertyValue("yarn.resourcemanager.address") != null)
+      sparkLauncher.setConf("spark.hadoop.yarn.resourcemanager.address", PropertyUtil.getPropertyValue("yarn.resourcemanager.address"))
+    if(PropertyUtil.getPropertyValue("yarn.access.namenode") != null)
+      sparkLauncher.setConf("spark.yarn.access.namenode", PropertyUtil.getPropertyValue("yarn.access.namenode"))
+    if(PropertyUtil.getPropertyValue("yarn.stagingDir") != null)
+      sparkLauncher.setConf("spark.yarn.stagingDir", PropertyUtil.getPropertyValue("yarn.stagingDir"))
+    if(PropertyUtil.getPropertyValue("yarn.jars") != null)
+      sparkLauncher.setConf("spark.yarn.jars", PropertyUtil.getPropertyValue("yarn.jars"))
+
+      val handle = sparkLauncher.startApplication( new SparkAppHandle.Listener {
         override def stateChanged(handle: SparkAppHandle): Unit = {
           appId = handle.getAppId
           val sparkAppState = handle.getState
@@ -167,15 +174,7 @@ object API {
   def stopFlow(appID : String, process : SparkAppHandle) : String = {
 
     //yarn application kill appId
-    val url = PropertyUtil.getPropertyValue("yarn.url") + appID + "/state"
-    val client = HttpClients.createDefault()
-    val put:HttpPut = new HttpPut(url)
-    val body ="{\"state\":\"KILLED\"}"
-    put.addHeader("Content-Type", "application/json")
-    put.setEntity(new StringEntity(body))
-    val response:CloseableHttpResponse = client.execute(put)
-    val entity = response.getEntity
-    val str = EntityUtils.toString(entity,"UTF-8")
+    stopFlowOnYarn(appID)
 
     //process kill
     process.kill()
@@ -187,6 +186,20 @@ object API {
     "ok"
   }
 
+  def stopFlowOnYarn(appID : String) : String = {
+    //yarn application kill appId
+    val url = PropertyUtil.getPropertyValue("yarn.url") + appID + "/state"
+    val client = HttpClients.createDefault()
+    val put:HttpPut = new HttpPut(url)
+    val body ="{\"state\":\"KILLED\"}"
+    put.addHeader("Content-Type", "application/json")
+    put.setEntity(new StringEntity(body))
+    val response:CloseableHttpResponse = client.execute(put)
+    val entity = response.getEntity
+    val str = EntityUtils.toString(entity,"UTF-8")
+    str
+  }
+
   def getFlowInfo(appID : String) : String = {
     val flowInfo = H2Util.getFlowInfo(appID)
     flowInfo