diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
index 79c540597c307284757e2f3e813067907022543c..e5676a44925172b357c1b31ebaa31a3f78e7bbbc 100755
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
@@ -63,6 +63,8 @@ public class TSDBJNIConnector {
 
     public static native String getTsCharset();
 
+    public static native int setConfig(String config);
+
     public boolean connect(String host, int port, String dbName, String user, String password) throws SQLException {
         if (this.taos != TSDBConstants.JNI_NULL_POINTER) {
             closeConnection();
@@ -358,6 +360,5 @@ public class TSDBJNIConnector {
 
     private native int insertLinesImp(String[] lines, long conn);
 
-    private native int setConfig(String config);
 
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SetConfigurationInJNITest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SetConfigurationInJNITest.java
index fe51383a044d555d8c6b610854bf233feae747ba..c083716277b6d805a2bb554beb523bd8396ebdd8 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SetConfigurationInJNITest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/SetConfigurationInJNITest.java
@@ -19,13 +19,17 @@ public class SetConfigurationInJNITest {
     @Test
     public void testDebugFlag() {
         try {
+            // init
             TSDBJNIConnector.initImp(null);
             TSDBJNIConnector.setOptions(0, null);
             TSDBJNIConnector.setOptions(1, null);
             TSDBJNIConnector.setOptions(2, null);
             String tsCharset = TSDBJNIConnector.getTsCharset();
-            System.out.println(tsCharset);
+            assertEquals("", tsCharset);
 
+            TSDBJNIConnector.setConfig(debugFlagJSON);
+
+            // connect
             TSDBJNIConnector jniConnector = new TSDBJNIConnector();
             boolean connected = jniConnector.connect(host, 0, null, "root", "taosdata");
             assertTrue(connected);