diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisTestBase.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisTestBase.java
index 31ff2b124..dca9a1c66 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisTestBase.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisTestBase.java
@@ -59,7 +59,6 @@ public abstract class DorisTestBase {
     protected static final String USERNAME = "root";
     protected static final String PASSWORD = "";
     protected static final GenericContainer DORIS_CONTAINER = createDorisContainer();
-    protected static Connection connection;
     protected static final int DEFAULT_PARALLELISM = 4;
 
     protected static String getFenodes() {
@@ -118,10 +117,10 @@ protected static void initializeJdbcConnection() throws Exception {
                         new URL[] {new URL(DRIVER_JAR)}, DorisTestBase.class.getClassLoader());
         LOG.info("Try to connect to Doris...");
         Thread.currentThread().setContextClassLoader(urlClassLoader);
-        connection =
-                DriverManager.getConnection(
-                        String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
-        try (Statement statement = connection.createStatement()) {
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             ResultSet resultSet;
             do {
                 LOG.info("Wait for the Backend to start successfully...");
@@ -143,14 +142,11 @@ private static boolean isBeReady(ResultSet rs, Duration duration) throws SQLExce
     }
 
     protected static void printClusterStatus() throws Exception {
-        LOG.info(
-                "{} {} Current machine IP: {} {} {}",
-                Thread.currentThread().getId(),
-                Thread.currentThread().getName(),
-                InetAddress.getLocalHost(),
-                connection.isClosed(),
-                connection.isValid(1000));
-        try (Statement statement = connection.createStatement()) {
+        LOG.info("Current machine IP: {}", InetAddress.getLocalHost());
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             ResultSet showFrontends = statement.executeQuery("show frontends");
             LOG.info("Frontends status: {}", convertList(showFrontends));
             ResultSet showBackends = statement.executeQuery("show backends");
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/DorisSinkITCase.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/DorisSinkITCase.java
index 26cbc2c4a..646b5b20b 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/DorisSinkITCase.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/DorisSinkITCase.java
@@ -30,6 +30,8 @@
 import org.junit.Test;
 import org.junit.jupiter.api.Assertions;
 
+import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.Arrays;
@@ -61,9 +63,13 @@ public void testSinkCsvFormat() throws Exception {
 
         Thread.sleep(10000);
         Set<List<Object>> actual = new HashSet<>();
-        try (Statement sinkStatement = connection.createStatement()) {
+
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             ResultSet sinkResultSet =
-                    sinkStatement.executeQuery(
+                    statement.executeQuery(
                             String.format(
                                     "select name,age from %s.%s order by 1", DATABASE, TABLE_CSV));
             while (sinkResultSet.next()) {
@@ -102,9 +108,12 @@ public void testSinkJsonFormat() throws Exception {
 
         Thread.sleep(10000);
         Set<List<Object>> actual = new HashSet<>();
-        try (Statement sinkStatement = connection.createStatement()) {
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             ResultSet sinkResultSet =
-                    sinkStatement.executeQuery(
+                    statement.executeQuery(
                             String.format(
                                     "select name,age from %s.%s order by 1", DATABASE, TABLE_JSON));
             while (sinkResultSet.next()) {
@@ -172,9 +181,12 @@ public void testTableSinkJsonFormat() throws Exception {
 
         Thread.sleep(10000);
         Set<List<Object>> actual = new HashSet<>();
-        try (Statement sinkStatement = connection.createStatement()) {
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             ResultSet sinkResultSet =
-                    sinkStatement.executeQuery(
+                    statement.executeQuery(
                             String.format(
                                     "select name,age from %s.%s order by 1",
                                     DATABASE, TABLE_JSON_TBL));
@@ -191,7 +203,10 @@ public void testTableSinkJsonFormat() throws Exception {
     }
 
     private void initializeTable(String table) throws Exception {
-        try (Statement statement = connection.createStatement()) {
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             statement.execute(String.format("CREATE DATABASE IF NOT EXISTS %s", DATABASE));
             statement.execute(String.format("DROP TABLE IF EXISTS %s.%s", DATABASE, table));
             statement.execute(
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/source/DorisSourceITCase.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/source/DorisSourceITCase.java
index a5a3b534a..3c4735502 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/source/DorisSourceITCase.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/source/DorisSourceITCase.java
@@ -32,6 +32,8 @@
 import org.junit.Test;
 import org.junit.jupiter.api.Assertions;
 
+import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.Statement;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -111,7 +113,10 @@ public void testTableSource() throws Exception {
     }
 
     private void initializeTable(String table) throws Exception {
-        try (Statement statement = connection.createStatement()) {
+        try (Connection connection =
+                        DriverManager.getConnection(
+                                String.format(URL, DORIS_CONTAINER.getHost()), USERNAME, PASSWORD);
+                Statement statement = connection.createStatement()) {
             statement.execute(String.format("CREATE DATABASE IF NOT EXISTS %s", DATABASE));
             statement.execute(String.format("DROP TABLE IF EXISTS %s.%s", DATABASE, table));
             statement.execute(