diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BaseTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BaseTest.java
deleted file mode 100644
index ce3735c12894807efadd1f5673fc34eee43ae01b..0000000000000000000000000000000000000000
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/BaseTest.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.taosdata.jdbc;
-
-import com.taosdata.jdbc.utils.TDNodes;
-
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-
-public abstract class BaseTest {
-
-    private static boolean testCluster = false;
-    private static TDNodes nodes = new TDNodes();
-
-    @BeforeClass
-    public static void setupEnv() {
-        try {
-            if (nodes.getTDNode(1).getTaosdPid() != null) {
-                System.out.println("Kill taosd before running JDBC test");
-                nodes.getTDNode(1).setRunning(1);
-                nodes.stop(1);
-            }
-            nodes.setTestCluster(testCluster);
-            nodes.deploy(1);
-            nodes.start(1);
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-
-    @AfterClass
-    public static void cleanUpEnv() {
-        nodes.stop(1);
-    }
-}
\ No newline at end of file
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/ResultSetTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/ResultSetTest.java
index 8067c547df148587766d87e204f5abad2bfb659d..b70bcd3c23e3695eca391437e3e4a844d0206dcc 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/ResultSetTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/ResultSetTest.java
@@ -13,42 +13,37 @@ import java.util.Properties;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
-public class ResultSetTest extends BaseTest {
-    static Connection connection = null;
-    static Statement statement = null;
+public class ResultSetTest {
+    static Connection connection;
+    static Statement statement;
     static String dbName = "test";
     static String tName = "t0";
     static String host = "localhost";
-    static ResultSet resSet = null;
+    static ResultSet resSet;
 
     @BeforeClass
-    public static void createDatabaseAndTable() throws SQLException {
+    public static void createDatabaseAndTable() {
         try {
             Class.forName("com.taosdata.jdbc.TSDBDriver");
-        } catch (ClassNotFoundException e) {
+            Properties properties = new Properties();
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-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.execute("use " + dbName);
+            statement.executeUpdate("create table if not exists " + dbName + "." + tName + " (ts timestamp, k1 int, k2 bigint, k3 float, k4 double, k5 binary(30), k6 smallint, k7 bool, k8 nchar(20))");
+        } catch (ClassNotFoundException | SQLException e) {
             return;
         }
-        Properties properties = new Properties();
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-        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("create table if not exists " + dbName + "." + tName +
-                " (ts timestamp, k1 int, k2 bigint, k3 float, k4 double, k5 binary(30), k6 smallint, k7 bool, k8 nchar(20))");
-
-        statement.executeQuery("use " + dbName);
     }
 
     @Test
     public void testResultSet() {
-        String sql = null;
+        String sql;
         long ts = 1496732686000l;
         int v1 = 2147483600;
         long v2 = ts + 1000;
@@ -815,13 +810,18 @@ public class ResultSetTest extends BaseTest {
         assertEquals(res.length, 2);
         statement.clearBatch();
     }
-    @AfterClass
-    public static void close() throws Exception {
-        statement.executeUpdate("drop database " + dbName);
-        statement.close();
-        connection.close();
-        Thread.sleep(10);
 
+    @AfterClass
+    public static void close() {
+        try {
+            statement.executeUpdate("drop database " + dbName);
+            if (statement != null)
+                statement.close();
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
     }
 
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java
index a79512984e6d78fda30b1281fefe91ddea7c2434..f78f8992945978aedf8a4f98d50097612b00a305 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java
@@ -16,23 +16,22 @@ public class StatementTest {
     static String dbName = "test";
     static String tName = "t0";
     static String host = "localhost";
-    static ResultSet resSet = null;
 
     @BeforeClass
     public static void createConnection() throws SQLException {
         try {
             Class.forName("com.taosdata.jdbc.TSDBDriver");
+            Properties properties = new Properties();
+            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/?user=root&password=taosdata", properties);
+            statement = connection.createStatement();
+            statement.executeUpdate("drop database if exists " + dbName);
+
         } catch (ClassNotFoundException e) {
             return;
         }
-        Properties properties = new Properties();
-        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/?user=root&password=taosdata", properties);
-
-        statement = connection.createStatement();
-        statement.executeUpdate("drop database if exists " + dbName);
     }
 
     @Test
@@ -49,7 +48,6 @@ public class StatementTest {
         } catch (SQLException e) {
             e.printStackTrace();
         }
-
     }
 
     @Test
@@ -173,12 +171,15 @@ public class StatementTest {
     }
 
     @AfterClass
-    public static void close() throws Exception {
-        if (!statement.isClosed()) {
-            statement.executeUpdate("drop database if exists " + dbName);
-            statement.close();
-            connection.close();
-            Thread.sleep(10);
+    public static void close() {
+        try {
+            statement.execute("drop database if exists " + dbName);
+            if (statement != null)
+                statement.close();
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
         }
     }
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SubscribeTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SubscribeTest.java
index 1b09f6d5023c00770d4794a913b3e884dd348fb4..1d8ff08db6d5f177fe74de579e1b6bb26ee35750 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SubscribeTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SubscribeTest.java
@@ -19,27 +19,28 @@ public class SubscribeTest {
     String topic = "test";
 
     @Before
-    public void createDatabase() throws SQLException {
+    public void createDatabase() {
         try {
             Class.forName("com.taosdata.jdbc.TSDBDriver");
-        } 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);
+            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("create database if not exists " + dbName);
-        statement.executeUpdate("create table if not exists " + dbName + "." + tName + " (ts timestamp, k int, v int)");
-        long ts = System.currentTimeMillis();
-        for (int i = 0; i < 2; i++) {
-            ts += i;
-            String sql = "insert into " + dbName + "." + tName + " values (" + ts + ", " + (100 + i) + ", " + i + ")";
-            statement.executeUpdate(sql);
+            statement = connection.createStatement();
+            statement.executeUpdate("create database if not exists " + dbName);
+            statement.executeUpdate("create table if not exists " + dbName + "." + tName + " (ts timestamp, k int, v int)");
+            long ts = System.currentTimeMillis();
+            for (int i = 0; i < 2; i++) {
+                ts += i;
+                String sql = "insert into " + dbName + "." + tName + " values (" + ts + ", " + (100 + i) + ", " + i + ")";
+                statement.executeUpdate(sql);
+            }
+
+        } catch (ClassNotFoundException | SQLException e) {
+            return;
         }
     }
 
@@ -79,10 +80,16 @@ public class SubscribeTest {
     }
 
     @After
-    public void close() throws Exception {
-        statement.executeQuery("drop database " + dbName);
-        statement.close();
-        connection.close();
-        Thread.sleep(10);
+    public void close() {
+        try {
+            statement.executeQuery("drop database " + dbName);
+            if (statement != null)
+                statement.close();
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
     }
 }
\ No newline at end of file
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDatabaseMetaDataTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDatabaseMetaDataTest.java
index 8066b38573b87d9d5b91a628b56ab5700e379113..e3f0d1b8b275f6ded65501343fac488e9df309b6 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDatabaseMetaDataTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDatabaseMetaDataTest.java
@@ -6,37 +6,9 @@ import java.sql.*;
 import java.util.Properties;
 
 public class TSDBDatabaseMetaDataTest {
-    private TSDBDatabaseMetaData metaData;
     private static final String host = "127.0.0.1";
-    private Connection connection;
-
-    @BeforeClass
-    public void before() {
-        try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
-            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 + ":6030/?user=root&password=taosdata", properties);
-            metaData = connection.getMetaData().unwrap(TSDBDatabaseMetaData.class);
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @AfterClass
-    public void after() {
-        try {
-            if (connection != null)
-                connection.close();
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
+    private static Connection connection;
+    private static TSDBDatabaseMetaData metaData;
 
     @Test
     public void unwrap() throws SQLException {
@@ -975,4 +947,33 @@ public class TSDBDatabaseMetaDataTest {
     public void generatedKeyAlwaysReturned() throws SQLException {
         Assert.assertFalse(metaData.generatedKeyAlwaysReturned());
     }
+
+    @BeforeClass
+    public static void before() {
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+            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 + ":6030/?user=root&password=taosdata", properties);
+            metaData = connection.getMetaData().unwrap(TSDBDatabaseMetaData.class);
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @AfterClass
+    public static void after() {
+        try {
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDriverTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDriverTest.java
index 8adcdefb2974d5817793297091eee1c2f40a52b9..445723f501a85f7c697afffb59b273bcf6a1a630 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDriverTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDriverTest.java
@@ -3,9 +3,6 @@ package com.taosdata.jdbc;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
 import java.sql.*;
 import java.util.Properties;
 
@@ -27,54 +24,15 @@ public class TSDBDriverTest {
             "jdbc:TAOS://:/test",
             "jdbc:TAOS://localhost:0/?user=root&password=taosdata"
     };
-    private static boolean islibLoaded = false;
-    private static boolean isTaosdActived;
 
     private Connection conn;
 
-    @BeforeClass
-    public static void before() {
-        String osName = System.getProperty("os.name").toLowerCase();
-        if (!osName.equals("linux"))
-            return;
-        // try to load taos lib
-        try {
-            System.loadLibrary("taos");
-            islibLoaded = true;
-        } catch (UnsatisfiedLinkError error) {
-            System.out.println("load tdengine lib failed.");
-            error.printStackTrace();
-        }
-        // check taosd is activated
-        try {
-            String[] cmd = {"/bin/bash", "-c", "ps -ef | grep taosd | grep -v \"grep\""};
-            Process exec = Runtime.getRuntime().exec(cmd);
-            BufferedReader reader = new BufferedReader(new InputStreamReader(exec.getInputStream()));
-            int lineCnt = 0;
-            while (reader.readLine() != null) {
-                lineCnt++;
-            }
-            if (lineCnt > 0)
-                isTaosdActived = true;
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-
-        try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
-        }
-    }
-
     @Test
     public void testConnectWithJdbcURL() {
         final String url = "jdbc:TAOS://localhost:6030/log?user=root&password=taosdata";
         try {
-            if (islibLoaded && isTaosdActived) {
-                conn = DriverManager.getConnection(url);
-                assertNotNull("failure - connection should not be null", conn);
-            }
+            conn = DriverManager.getConnection(url);
+            assertNotNull("failure - connection should not be null", conn);
         } catch (SQLException e) {
             e.printStackTrace();
             fail("failure - should not throw Exception");
@@ -89,10 +47,8 @@ public class TSDBDriverTest {
         connProps.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
         connProps.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
         try {
-            if (islibLoaded && isTaosdActived) {
-                conn = DriverManager.getConnection(jdbcUrl, connProps);
-                assertNotNull("failure - connection should not be null", conn);
-            }
+            conn = DriverManager.getConnection(jdbcUrl, connProps);
+            assertNotNull("failure - connection should not be null", conn);
         } catch (SQLException e) {
             e.printStackTrace();
             fail("failure - should not throw Exception");
@@ -107,10 +63,8 @@ public class TSDBDriverTest {
         connProps.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
         connProps.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
         try {
-            if (islibLoaded && isTaosdActived) {
-                conn = DriverManager.getConnection(jdbcUrl, connProps);
-                assertNotNull("failure - connection should not be null", conn);
-            }
+            conn = DriverManager.getConnection(jdbcUrl, connProps);
+            assertNotNull("failure - connection should not be null", conn);
         } catch (SQLException e) {
             e.printStackTrace();
             fail("failure - should not throw Exception");
@@ -207,4 +161,14 @@ public class TSDBDriverTest {
         assertNull("failure - getParentLogger should be be null", new TSDBDriver().getParentLogger());
     }
 
+    @BeforeClass
+    public static void before() {
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+
 }
\ No newline at end of file
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java
index 9608c4985db15312e8e2966badfe4db8241bc306..66749d057c444b81145b6ec37699bf9a53faaabc 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java
@@ -1,14 +1,13 @@
 package com.taosdata.jdbc.cases;
 
+import com.taosdata.jdbc.TSDBDriver;
 import com.taosdata.jdbc.lib.TSDBCommon;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
-import java.sql.Connection;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.sql.Statement;
+import java.sql.*;
+import java.util.Properties;
 import java.util.Random;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -18,30 +17,47 @@ import static org.junit.Assert.assertEquals;
 
 public class BatchInsertTest {
 
-    static String host = "localhost";
+    static String host = "127.0.0.1";
     static String dbName = "test";
     static String stbName = "meters";
     static int numOfTables = 30;
     final static int numOfRecordsPerTable = 1000;
     static long ts = 1496732686000l;
     final static String tablePrefix = "t";
-
     private Connection connection;
 
     @Before
     public void before() {
         try {
-            connection = TSDBCommon.getConn(host);
-            TSDBCommon.createDatabase(connection, dbName);
-            TSDBCommon.createStable(connection, stbName);
-            TSDBCommon.createTables(connection, numOfTables, stbName, tablePrefix);
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+            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 statement = connection.createStatement();
+            statement.executeUpdate("drop database if exists " + dbName);
+            statement.executeUpdate("create database if not exists " + dbName);
+            statement.executeUpdate("use " + dbName);
+            // create stable
+            String createTableSql = "create table " + stbName + "(ts timestamp, f1 int, f2 int, f3 int) tags(areaid int, loc binary(20))";
+            statement.executeUpdate(createTableSql);
+            // create tables
+            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);
+            }
+            statement.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 
     @Test
-    public void testBatchInsert(){
+    public void testBatchInsert() {
         ExecutorService executorService = Executors.newFixedThreadPool(numOfTables);
         for (int i = 0; i < numOfTables; i++) {
             final int index = i;
@@ -63,7 +79,7 @@ public class BatchInsertTest {
                         statement.addBatch(sb.toString());
                         statement.executeBatch();
                         long endTime = System.currentTimeMillis();
-                        System.out.println("Thread " + index + " takes " + (endTime - startTime) +  " microseconds");
+                        System.out.println("Thread " + index + " takes " + (endTime - startTime) + " microseconds");
                         connection.commit();
                         statement.close();
                     } catch (Exception e) {
@@ -80,7 +96,7 @@ public class BatchInsertTest {
             e.printStackTrace();
         }
 
-        try{
+        try {
             Statement statement = connection.createStatement();
             ResultSet rs = statement.executeQuery("select * from meters");
             int num = 0;
@@ -89,7 +105,7 @@ public class BatchInsertTest {
             }
             assertEquals(num, numOfTables * numOfRecordsPerTable);
             rs.close();
-        }catch (Exception e){
+        } catch (Exception e) {
             e.printStackTrace();
         }
     }
@@ -102,7 +118,6 @@ public class BatchInsertTest {
         } catch (SQLException e) {
             e.printStackTrace();
         }
-
     }
 
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/lib/TSDBCommon.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/lib/TSDBCommon.java
deleted file mode 100644
index 0e2613d617074571c86c39ef253d68af9a0f6922..0000000000000000000000000000000000000000
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/lib/TSDBCommon.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.taosdata.jdbc.lib;
-
-import com.taosdata.jdbc.TSDBDriver;
-
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.Properties;
-
-public class TSDBCommon {
-
-    public static Connection getConn(String host) throws SQLException, ClassNotFoundException {
-        Class.forName("com.taosdata.jdbc.TSDBDriver");
-        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");
-        return DriverManager.getConnection("jdbc:TAOS://" + host + ":0/", properties);
-    }
-
-    public static void createDatabase(Connection connection, String dbName) throws SQLException {
-        Statement statement = connection.createStatement();
-        statement.executeUpdate("drop database if exists " + dbName);
-        statement.executeUpdate("create database if not exists " + dbName);
-        statement.executeUpdate("use " + dbName);
-        statement.close();
-    }
-
-    public static void createStable(Connection connection, String stbName) throws SQLException {
-        Statement statement = connection.createStatement();
-        String createTableSql = "create table " + stbName + "(ts timestamp, f1 int, f2 int, f3 int) tags(areaid int, loc binary(20))";
-        statement.executeUpdate(createTableSql);
-        statement.close();
-    }
-
-    public static void createTables(Connection connection, int numOfTables, String stbName,String tablePrefix) throws SQLException {
-        Statement statement = connection.createStatement();
-        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);
-        }
-        statement.close();
-    }
-}