diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BatchInsertTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BatchInsertTest.java
index 7d96cbb5381d099f7b67ecdb5414093c54b37b65..4046e3edf6e1d9d62ceddaf99f73212dd1dd02c2 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BatchInsertTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BatchInsertTest.java
@@ -13,17 +13,17 @@ import java.util.concurrent.TimeUnit;
 
 import static org.junit.Assert.assertEquals;
 
-public class BatchInsertTest extends BaseTest {
-
-    static Connection connection = null;
-    static Statement statement = null;
-    static String dbName = "test";
-    static String stbName = "meters";
-    static String host = "localhost";
-    static int numOfTables = 30;
-    final static int numOfRecordsPerTable = 1000;
-    static long ts = 1496732686000l;
-    final static String tablePrefix = "t";
+public class BatchInsertTest {
+
+    private Connection connection;
+
+    private static String dbName = "test";
+    private static String stbName = "meters";
+    private static String host = "127.0.0.1";
+    private static int numOfTables = 30;
+    private static int numOfRecordsPerTable = 1000;
+    private static long ts = 1496732686000l;
+    private static String tablePrefix = "t";
 
     @Before
     public void createDatabase() throws SQLException {
@@ -32,65 +32,58 @@ public class BatchInsertTest extends BaseTest {
         } catch (ClassNotFoundException e) {
             return;
         }
-        
+
         Properties properties = new Properties();
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
         properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
         properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
         properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
         connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/", properties);
-                
-        statement = connection.createStatement();
-        statement.executeUpdate("drop database if exists " + dbName);
-        statement.executeUpdate("create database if not exists " + dbName);
-        statement.executeUpdate("use " + dbName);
 
-        String createTableSql = "create table " + stbName + "(ts timestamp, f1 int, f2 int, f3 int) tags(areaid int, loc binary(20))";  
-        statement.executeUpdate(createTableSql); 
+        Statement stmt = connection.createStatement();
+        stmt.execute("drop database if exists " + dbName);
+        stmt.execute("create database if not exists " + dbName);
+        stmt.execute("use " + dbName);
+
+        String createTableSql = "create table " + stbName + "(ts timestamp, f1 int, f2 int, f3 int) tags(areaid int, loc binary(20))";
+        stmt.execute(createTableSql);
 
-        for(int i = 0; i < numOfTables; i++) {
+        for (int i = 0; i < numOfTables; i++) {
             String loc = i % 2 == 0 ? "beijing" : "shanghai";
-            String createSubTalbesSql = "create table " + tablePrefix + i + " using " + stbName + " tags(" + i + ", '" + loc + "')";             
-            statement.executeUpdate(createSubTalbesSql); 
+            String createSubTalbesSql = "create table " + tablePrefix + i + " using " + stbName + " tags(" + i + ", '" + loc + "')";
+            stmt.execute(createSubTalbesSql);
         }
-
+        stmt.close();
     }
-    
+
     @Test
-    public void testBatchInsert() throws SQLException{
-        
-        ExecutorService executorService = Executors.newFixedThreadPool(numOfTables);        
-                    
-        for (int i = 0; i < numOfTables; i++) { 
-            final int index = i;                       
-            executorService.execute(new Runnable() {
-                @Override
-                public void run() {                    
-                    try {                        
-                        long startTime = System.currentTimeMillis();                        
-                        Statement statement = connection.createStatement(); // get statement                        
-                        StringBuilder sb = new StringBuilder();
-                        sb.append("INSERT INTO " + tablePrefix + index + " VALUES");
-                        Random rand = new Random();
-                        for (int j = 1; j <= numOfRecordsPerTable; j++) {
-                            sb.append("(" + (ts + j) + ", ");
-                            sb.append(rand.nextInt(100) + ", ");
-                            sb.append(rand.nextInt(100) + ", ");
-                            sb.append(rand.nextInt(100) + ")");                            
-                        }                        
-                        statement.addBatch(sb.toString());                        
-                        statement.executeBatch();
-                        long endTime = System.currentTimeMillis();
-                        System.out.println("Thread " + index + " takes " + (endTime - startTime) +  " microseconds");
-                        connection.commit();                                                
-                        statement.close();                        
-                    } catch (Exception e) {
-                        e.printStackTrace();
+    public void testBatchInsert() throws SQLException {
+        ExecutorService executorService = Executors.newFixedThreadPool(numOfTables);
+        for (int i = 0; i < numOfTables; i++) {
+            final int index = i;
+            executorService.execute(() -> {
+                try {
+                    long startTime = System.currentTimeMillis();
+                    Statement statement = connection.createStatement(); // get statement
+                    StringBuilder sb = new StringBuilder();
+                    sb.append("INSERT INTO " + tablePrefix + index + " VALUES");
+                    Random rand = new Random();
+                    for (int j = 1; j <= numOfRecordsPerTable; j++) {
+                        sb.append("(" + (ts + j) + ", ");
+                        sb.append(rand.nextInt(100) + ", ");
+                        sb.append(rand.nextInt(100) + ", ");
+                        sb.append(rand.nextInt(100) + ")");
                     }
+                    statement.addBatch(sb.toString());
+                    statement.executeBatch();
+                    long endTime = System.currentTimeMillis();
+                    System.out.println("Thread " + index + " takes " + (endTime - startTime) + " microseconds");
+                    connection.commit();
+                    statement.close();
+                } catch (Exception e) {
+                    e.printStackTrace();
                 }
             });
         }
-
         executorService.shutdown();
 
         try {
@@ -100,21 +93,23 @@ public class BatchInsertTest extends BaseTest {
         }
 
         Statement statement = connection.createStatement();
-        ResultSet rs = statement.executeQuery("select * from meters"); 
+        ResultSet rs = statement.executeQuery("select * from meters");
         int num = 0;
         while (rs.next()) {
             num++;
-        }           
-        assertEquals(num, numOfTables * numOfRecordsPerTable);        
+        }
+        assertEquals(num, numOfTables * numOfRecordsPerTable);
         rs.close();
     }
 
-
     @After
-    public void close() throws Exception {        
-        statement.close();
-        connection.close();
-        Thread.sleep(10);
+    public void close() {
+        try {
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
     }
-    
+
 }
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