diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/DatabaseMetaDataTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/DatabaseMetaDataTest.java
index 284af3dfe75f7c436ec2ce875714afc235c525d8..19dabe07462b6481b2ab5460aad7ac5712e21b7c 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/DatabaseMetaDataTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/DatabaseMetaDataTest.java
@@ -7,7 +7,7 @@ import org.junit.Test;
 import java.sql.*;
 import java.util.Properties;
 
-public class DatabaseMetaDataTest extends BaseTest {
+public class DatabaseMetaDataTest {
     static Connection connection = null;
     static PreparedStatement statement = null;
     static String dbName = "test";
@@ -23,20 +23,21 @@ public class DatabaseMetaDataTest extends BaseTest {
         }
         Properties properties = new Properties();
         properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_USER, "root");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_PASSWORD, "taosdata");
         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);
 
         String sql = "drop database if exists " + dbName;
-        statement = (TSDBPreparedStatement) connection.prepareStatement(sql);
+        statement = connection.prepareStatement(sql);
         statement.executeUpdate("create database if not exists " + dbName);
         statement.executeUpdate("create table if not exists " + dbName + "." + tName + " (ts timestamp, k int, v int)");
     }
 
     @Test
     public void testMetaDataTest() throws SQLException {
-
         DatabaseMetaData databaseMetaData = connection.getMetaData();
         ResultSet resultSet = databaseMetaData.getTables(dbName, "t*", "t*", new String[]{"t"});
         while (resultSet.next()) {
@@ -180,7 +181,7 @@ public class DatabaseMetaDataTest extends BaseTest {
         databaseMetaData.getCatalogs();
 //        databaseMetaData.getTableTypes();
 
-        databaseMetaData.getColumns("", "", "", "");
+        databaseMetaData.getColumns(dbName, "", tName, "");
         databaseMetaData.getColumnPrivileges("", "", "", "");
         databaseMetaData.getTablePrivileges("", "", "");
         databaseMetaData.getBestRowIdentifier("", "", "", 0, false);
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java
index 8de2e3b442b9b2ea1b84687878ba3bb4faf5e4d6..19bc5f713f9b406a943fc640fd03bb0503ed2967 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java
@@ -19,7 +19,7 @@ public class AppMemoryLeakTest {
         }
     }
 
-    @Test
+    @Test(expected = Exception.class)
     public void testCreateTooManyStatement() throws ClassNotFoundException, SQLException {
         Class.forName("com.taosdata.jdbc.TSDBDriver");
         int stmtCnt = 0;
@@ -30,15 +30,4 @@ public class AppMemoryLeakTest {
         }
     }
 
-    public static void main(String[] args) throws ClassNotFoundException, SQLException {
-        Class.forName("com.taosdata.jdbc.TSDBDriver");
-        int stmtCnt = 0;
-        Connection conn = DriverManager.getConnection("jdbc:TAOS://localhost:6030/?user=root&password=taosdata");
-        while (true) {
-            Statement stmt = conn.createStatement();
-            System.out.println(++stmtCnt + " : " + stmt);
-        }
-    }
-
-
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SqlSyntaxValidatorTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SqlSyntaxValidatorTest.java
index fb570e16c4e0ef8036ccd2c29cdc51e1938b2139..ce84f967d09e2217bac90cc7a3f59bf4f50b2a15 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SqlSyntaxValidatorTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SqlSyntaxValidatorTest.java
@@ -5,10 +5,6 @@ import org.junit.Test;
 
 public class SqlSyntaxValidatorTest {
 
-    @Test
-    public void validateSqlSyntax() {
-    }
-
     @Test
     public void isSelectSQL() {
         Assert.assertTrue(SqlSyntaxValidator.isSelectSql("select * from test.weather"));