diff --git a/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksStreamLoadVisitor.java b/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksStreamLoadVisitor.java
index a9d10621..aecac149 100644
--- a/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksStreamLoadVisitor.java
+++ b/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksStreamLoadVisitor.java
@@ -168,7 +168,7 @@ public class StarRocksStreamLoadVisitor {
     
     private String getBasicAuthHeader(String username, String password) {
         String auth = username + ":" + password;
-        byte[] encodedAuth = Base64.encodeBase64(auth.getBytes());
+        byte[] encodedAuth = Base64.encodeBase64(auth.getBytes(StandardCharsets.UTF_8));
         return new StringBuilder("Basic ").append(new String(encodedAuth)).toString();
     }
 
diff --git a/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksWriterManager.java b/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksWriterManager.java
index e5234425..0f68afe9 100644
--- a/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksWriterManager.java
+++ b/starrockswriter/src/main/java/com/starrocks/connector/datax/plugin/writer/starrockswriter/manager/StarRocksWriterManager.java
@@ -4,6 +4,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
@@ -38,7 +39,7 @@ public class StarRocksWriterManager {
         try {
             buffer.add(record);
             batchCount++;
-            batchSize += record.getBytes().length;
+            batchSize += record.getBytes(StandardCharsets.UTF_8).length;
             if (batchCount >= writerOptions.getBatchRows() || batchSize >= writerOptions.getBatchSize()) {
                 String label = createBatchLabel();
                 LOG.debug(String.format("StarRocks buffer Sinking triggered: rows[%d] label[%s].", batchCount, label));