diff --git a/tests/script/sh/deploy.sh b/tests/script/sh/deploy.sh
index 83ecea555a8c85eebadfd19fade5fd17340b237e..b3134938cbc063ed7c857f1839ff401a2b2bf904 100755
--- a/tests/script/sh/deploy.sh
+++ b/tests/script/sh/deploy.sh
@@ -96,6 +96,7 @@ echo "second              ${HOSTNAME}:7200" >> $TAOS_CFG
 echo "serverPort          ${NODE}"          >> $TAOS_CFG
 echo "dataDir             $DATA_DIR"      >> $TAOS_CFG
 echo "logDir              $LOG_DIR"       >> $TAOS_CFG
+echo "debugFlag           135"            >> $TAOS_CFG
 echo "dDebugFlag          135"            >> $TAOS_CFG
 echo "mDebugFlag          135"            >> $TAOS_CFG
 echo "sdbDebugFlag        135"            >> $TAOS_CFG
diff --git a/tests/script/sh/exec_tarbitrator.sh b/tests/script/sh/exec_tarbitrator.sh
new file mode 100755
index 0000000000000000000000000000000000000000..cb0a8858cb0bb394f322a5daf03e410bdefbbe2c
--- /dev/null
+++ b/tests/script/sh/exec_tarbitrator.sh
@@ -0,0 +1,64 @@
+#!/bin/sh
+
+# if [ $# != 2 || $# != 3 ]; then 
+  # echo "argument list need input : "
+  # echo "  -s start/stop"
+  # exit 1
+# fi
+
+EXEC_OPTON=
+while getopts "n:s:u:x:ct" arg 
+do
+  case $arg in
+    n)
+      NODE_NAME=$OPTARG
+      ;;
+    s)
+      EXEC_OPTON=$OPTARG
+      ;;
+    c)
+      CLEAR_OPTION="clear"
+      ;;
+    t)
+      SHELL_OPTION="true"
+      ;;
+    u)
+      USERS=$OPTARG
+      ;;
+    x)
+      SIGNAL=$OPTARG
+      ;;
+    ?)
+      echo "unkown argument"
+      ;;
+  esac
+done
+
+
+SCRIPT_DIR=`dirname $0`
+cd $SCRIPT_DIR/../
+SCRIPT_DIR=`pwd`
+
+cd ../../
+TAOS_DIR=`pwd`
+
+BUILD_DIR=$TAOS_DIR/../debug/build
+SIM_DIR=$TAOS_DIR/sim
+NODE_DIR=$SIM_DIR/arbitrator
+EXE_DIR=$BUILD_DIR/bin
+LOG_DIR=$NODE_DIR/log
+
+echo "------------ $EXEC_OPTON tarbitrator"
+
+if [ "$EXEC_OPTON" = "start" ]; then 
+  echo "------------ log path: $LOG_DIR"
+  nohup $EXE_DIR/tarbitrator -p 8000 -d 135 -g $LOG_DIR > /dev/null 2>&1 & 
+else
+  #relative path
+  PID=`ps -ef|grep tarbitrator | grep -v grep | awk '{print $2}'`
+  if [ -n "$PID" ]; then   
+  	sudo kill -9 $PID
+	  sudo pkill -9 tarbitrator
+  fi 
+fi
+
diff --git a/tests/script/sh/stop_dnodes.sh b/tests/script/sh/stop_dnodes.sh
index 2364dff9b33805130834f0da1ef21929a9d27c90..1a6e7153c39d1be84b2d8a4bf13338564d685a2f 100755
--- a/tests/script/sh/stop_dnodes.sh
+++ b/tests/script/sh/stop_dnodes.sh
@@ -13,3 +13,12 @@ while [ -n "$PID" ]; do
   fuser -k -n tcp 6030
   PID=`ps -ef|grep -w taosd | grep -v grep | awk '{print $2}'`
 done
+
+PID=`ps -ef|grep -w tarbitrator | grep -v grep | awk '{print $2}'`
+while [ -n "$PID" ]; do
+	echo kill -9 $PID 
+	pkill -9 tarbitrator
+  fuser -k -n tcp 6040
+  PID=`ps -ef|grep -w tarbitrator | grep -v grep | awk '{print $2}'`
+done
+
diff --git a/tests/script/test.sh b/tests/script/test.sh
index 96ab3c5808f493ece0da4643266d8630286d53b0..984eb13c4cd43e4725021387cc468f4c9364c4ec 100755
--- a/tests/script/test.sh
+++ b/tests/script/test.sh
@@ -62,6 +62,11 @@ CFG_DIR=$PRG_DIR/cfg
 LOG_DIR=$PRG_DIR/log
 DATA_DIR=$PRG_DIR/data
 
+
+ARBITRATOR_PRG_DIR=$SIM_DIR/arbitrator
+ARBITRATOR_LOG_DIR=$ARBITRATOR_PRG_DIR/log
+
+
 chmod -R 777 $PRG_DIR
 echo "------------------------------------------------------------------------"
 echo "Start TDengine Testing Case ..."
@@ -72,9 +77,12 @@ echo "CFG_DIR  : $CFG_DIR"
 
 rm -rf $LOG_DIR
 rm -rf $CFG_DIR
+rm -rf $ARBITRATOR_LOG_DIR
+
 mkdir -p $PRG_DIR
 mkdir -p $LOG_DIR
 mkdir -p $CFG_DIR
+mkdir -p $ARBITRATOR_LOG_DIR
 
 TAOS_CFG=$PRG_DIR/cfg/taos.cfg
 touch -f $TAOS_CFG
diff --git a/tests/script/unique/arbitrator/replica_changeWithArbitrator.sim b/tests/script/unique/arbitrator/replica_changeWithArbitrator.sim
new file mode 100644
index 0000000000000000000000000000000000000000..9a04d187fab146240d011e4ea7ba7522bb9dc818
--- /dev/null
+++ b/tests/script/unique/arbitrator/replica_changeWithArbitrator.sim
@@ -0,0 +1,242 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/deploy.sh -n dnode2 -i 2
+system sh/deploy.sh -n dnode3 -i 3
+
+system sh/cfg.sh -n dnode1 -c numOfMPeers -v 2
+system sh/cfg.sh -n dnode2 -c numOfMPeers -v 2
+system sh/cfg.sh -n dnode3 -c numOfMPeers -v 2
+
+system sh/cfg.sh -n dnode1 -c walLevel -v 1
+system sh/cfg.sh -n dnode2 -c walLevel -v 1
+system sh/cfg.sh -n dnode3 -c walLevel -v 1
+
+system sh/cfg.sh -n dnode1 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode2 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode3 -c balanceInterval -v 10
+
+system sh/cfg.sh -n dnode1 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode2 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode3 -c arbitrator -v $arbitrator
+
+print ============== step0: start tarbitrator
+system sh/exec_tarbitrator.sh -s start
+
+
+print ============== step1: replica is 1, and start 1 dnode
+system sh/exec_up.sh -n dnode1 -s start
+sleep 3000
+sql connect
+
+$db = replica_db1
+sql create database $db replica 1 maxTables 4
+sql use $db
+
+# create table , insert data
+$stb = repl_stb
+sql create table $stb (ts timestamp, c1 int) tags(t1 int)
+$rowNum = 10
+$tblNum = 12
+
+$ts0 = 1420041600000
+$ts = $ts0
+$delta = 1
+
+$i = 0
+while $i < $tblNum
+  $tb = tb . $i
+  sql create table $tb using $stb tags( $i )
+ 
+  $x = 0
+  while $x < $rowNum
+    $xs = $x * $delta
+    $ts = $ts0 + $xs
+    sql insert into $tb values ( $ts , $x ) 
+    $x = $x + 1
+  endw 
+  $i = $i + 1
+endw 
+
+print ============== step2: add 1 new dnode, expect balanced
+system sh/exec_up.sh -n dnode2 -s start
+sql create dnode $hostname2
+
+# expect after balanced, 2 vondes in dnode1, 1 vonde in dnode2
+$x = 0
+show2: 
+	$x = $x + 1
+	sleep 2000
+	if $x == 10 then
+		return -1
+	endi
+	
+sql show dnodes
+print dnode1 openVnodes $data2_1
+print dnode2 openVnodes $data2_2
+if $data2_1 != 2 then
+	goto show2
+endi
+if $data2_2 != 1 then
+	goto show2
+endi
+
+#print ============== step3: start tarbitrator
+#system sh/exec_tarbitrator.sh -s start
+
+return 1
+
+print ============== step4: stop dnode1, and wait dnode2 master
+system sh/exec_up.sh -n dnode1 -s stop
+
+$x = 0
+loop_wait:
+	$x = $x + 1
+	sleep 2000
+	if $x == 10 then
+	  print ERROR: after dnode1 stop, dnode2 didn't become a master! 
+		return -1
+	endi
+sql show mnodes
+$dnodeRole = $data2_1
+print dnodeRole ==> $dnodeRole
+print dnodeEp ==> $data1_1
+print hostname1 ==> $hostname1
+print arbitrator ==> $arbitrator
+
+if $dnodeRole != master then
+  goto loop_wait
+endi
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+# alter replica to 2
+#print ============== step3: alter replica to 2
+#sql alter database $db replica 2
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#$x = 0
+#show2: 
+#	$x = $x + 1
+#	sleep 2000
+#	if $x == 10 then 
+#		return -1
+#	endi
+#	
+#sql show mnodes
+#print dnode1 ==> $data2_1
+#print dnode2 ==> $data2_2
+#if $data2_1 != master then
+#	goto show2
+#endi
+#if $data2_2 != slave then
+#	goto show2
+#endi
+#
+#print ============== step3
+#sql_error drop dnode $hostname1 -x error1
+#print should not drop master
+#
+#print ============== step4
+#system sh/exec_up.sh -n dnode1 -s stop -x SIGINT
+#sql_error show mnodes
+#print error of no master
+#
+#print ============== step5
+#sql_error drop dnode $hostname1
+#print error of no master
+#
+#print ============== step6
+#system sh/exec_up.sh -n dnode1 -s start
+#sleep 2000
+#sql close
+#sql connect
+#
+#$x = 0
+#show6: 
+#	$x = $x + 1
+#	sleep 2000
+#	if $x == 10 then 
+#		return -1
+#	endi
+#	
+#sql show mnodes -x show6
+#print dnode1 ==> $data2_1
+#print dnode2 ==> $data2_2
+#if $data2_1 != master then
+#	goto show6
+#endi
+#if $data2_2 != slave then
+#	goto show6
+#endi
+#
+#print ============== step7
+#system sh/exec_up.sh -n dnode3 -s start
+#sql create dnode $hostname3
+#sleep 5000
+#
+#$x = 0
+#show7: 
+#	$x = $x + 1
+#	sleep 2000
+#	if $x == 10 then 
+#		return -1
+#	endi
+#	
+#sql show mnodes
+#print dnode1 ==> $data2_1
+#print dnode2 ==> $data2_2
+#print dnode3 ==> $data2_3
+#if $data2_1 != master then
+#	goto show7
+#endi
+#if $data2_2 != slave then
+#	goto show7
+#endi
+#if $data3_3 != null then
+#	goto show7
+#endi
+#
+#system sh/exec_up.sh -n dnode1 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode2 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode3 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode4 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode5 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode6 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode7 -s stop  -x SIGINT
+#system sh/exec_up.sh -n dnode8 -s stop  -x SIGINT
\ No newline at end of file
diff --git a/tests/tsim/src/simExe.c b/tests/tsim/src/simExe.c
index 5ea1cb4a1acf8c5f62046980189090eef1c43a23..0c35e3668c20b35f8e44a7883f8efeb03e64cc6d 100644
--- a/tests/tsim/src/simExe.c
+++ b/tests/tsim/src/simExe.c
@@ -36,12 +36,17 @@ void simLogSql(char *sql) {
   fflush(fp);
 }
 
+char *simParseArbitratorName(char *varName);
 char *simParseHostName(char *varName);
 char *simGetVariable(SScript *script, char *varName, int varLen) {
   if (strncmp(varName, "hostname", 8) == 0) {
     return simParseHostName(varName);
   }
 
+  if (strncmp(varName, "arbitrator", 10) == 0) {
+      return simParseArbitratorName(varName);
+  }
+
   if (strncmp(varName, "error", varLen) == 0) return script->error;
 
   if (strncmp(varName, "rows", varLen) == 0) return script->rows;
diff --git a/tests/tsim/src/simSystem.c b/tests/tsim/src/simSystem.c
index bac68c22d3dcbe5607f775a3a805f02d197b4409..3acfebb9bd56beb825360885059927dca777fd46 100644
--- a/tests/tsim/src/simSystem.c
+++ b/tests/tsim/src/simSystem.c
@@ -29,6 +29,12 @@ int simDebugFlag = 135;
 void simCloseTaosdConnect(SScript *script);
 char simHostName[128];
 
+char *simParseArbitratorName(char *varName) {
+  static char hostName[140];
+  sprintf(hostName, "%s:%d", simHostName, 8000);
+  return hostName;
+}
+
 char *simParseHostName(char *varName) {
   static char hostName[140];