diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/DorisSink.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/DorisSink.java
index bc2d45c86..ec2b736cc 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/DorisSink.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/DorisSink.java
@@ -22,7 +22,7 @@
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.rest.RestService;
 import org.apache.doris.flink.sink.committer.DorisCommitter;
-import org.apache.doris.flink.sink.writer.DorisRecordSerializer;
+import org.apache.doris.flink.sink.writer.serializer.DorisRecordSerializer;
 import org.apache.doris.flink.sink.writer.DorisWriter;
 import org.apache.doris.flink.sink.writer.DorisWriterState;
 import org.apache.doris.flink.sink.writer.DorisWriterStateSerializer;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchSink.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchSink.java
index 2c578d407..eea67b853 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchSink.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchSink.java
@@ -20,7 +20,7 @@
 import org.apache.doris.flink.cfg.DorisExecutionOptions;
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
-import org.apache.doris.flink.sink.writer.DorisRecordSerializer;
+import org.apache.doris.flink.sink.writer.serializer.DorisRecordSerializer;
 import org.apache.flink.api.connector.sink2.Sink;
 import org.apache.flink.api.connector.sink2.SinkWriter;
 import org.apache.flink.util.Preconditions;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchWriter.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchWriter.java
index 4f171b65e..08a58cdf4 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchWriter.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchWriter.java
@@ -20,7 +20,7 @@
 import org.apache.doris.flink.cfg.DorisExecutionOptions;
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
-import org.apache.doris.flink.sink.writer.DorisRecordSerializer;
+import org.apache.doris.flink.sink.writer.serializer.DorisRecordSerializer;
 import org.apache.doris.flink.sink.writer.LabelGenerator;
 import org.apache.flink.api.connector.sink2.Sink;
 import org.apache.flink.api.connector.sink2.SinkWriter;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisWriter.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisWriter.java
index 2ac10789e..cb330c3ab 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisWriter.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisWriter.java
@@ -27,6 +27,7 @@
 import org.apache.doris.flink.sink.BackendUtil;
 import org.apache.doris.flink.sink.DorisCommittable;
 import org.apache.doris.flink.sink.HttpUtil;
+import org.apache.doris.flink.sink.writer.serializer.DorisRecordSerializer;
 import org.apache.flink.annotation.VisibleForTesting;
 import org.apache.flink.api.connector.sink2.Sink;
 import org.apache.flink.api.connector.sink2.StatefulSink;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SchemaChangeHelper.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SchemaChangeHelper.java
index 8e6307b5f..c1380c7db 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SchemaChangeHelper.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SchemaChangeHelper.java
@@ -109,7 +109,7 @@ public static List<DDLSchema> getDdlSchemas() {
         return ddlSchemas;
     }
 
-    static class DDLSchema {
+    public static class DDLSchema {
         private final String columnName;
         private final boolean isDropColumn;
 
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisRecordSerializer.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/DorisRecordSerializer.java
similarity index 95%
rename from flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisRecordSerializer.java
rename to flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/DorisRecordSerializer.java
index 1c54c6b88..aa2b63dac 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/DorisRecordSerializer.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/DorisRecordSerializer.java
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-package org.apache.doris.flink.sink.writer;
+package org.apache.doris.flink.sink.writer.serializer;
 
 import org.apache.flink.api.java.tuple.Tuple2;
 
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/JsonDebeziumSchemaSerializer.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/JsonDebeziumSchemaSerializer.java
similarity index 99%
rename from flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/JsonDebeziumSchemaSerializer.java
rename to flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/JsonDebeziumSchemaSerializer.java
index e55f2a6c9..2171e842e 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/JsonDebeziumSchemaSerializer.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/JsonDebeziumSchemaSerializer.java
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-package org.apache.doris.flink.sink.writer;
+package org.apache.doris.flink.sink.writer.serializer;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.core.type.TypeReference;
@@ -33,6 +33,7 @@
 import org.apache.doris.flink.exception.IllegalArgumentException;
 import org.apache.doris.flink.rest.RestService;
 import org.apache.doris.flink.sink.HttpGetWithEntity;
+import org.apache.doris.flink.sink.writer.SchemaChangeHelper;
 import org.apache.doris.flink.sink.writer.SchemaChangeHelper.DDLSchema;
 import org.apache.doris.flink.tools.cdc.SourceConnector;
 import org.apache.doris.flink.tools.cdc.mysql.MysqlType;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RecordWithMetaSerializer.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RecordWithMetaSerializer.java
similarity index 55%
rename from flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RecordWithMetaSerializer.java
rename to flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RecordWithMetaSerializer.java
index 48182def4..21608a737 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RecordWithMetaSerializer.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RecordWithMetaSerializer.java
@@ -1,4 +1,21 @@
-package org.apache.doris.flink.sink.writer;
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.apache.doris.flink.sink.writer.serializer;
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.doris.flink.sink.batch.RecordWithMeta;
@@ -9,7 +26,7 @@
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 
-public class RecordWithMetaSerializer implements DorisRecordSerializer<RecordWithMeta>{
+public class RecordWithMetaSerializer implements DorisRecordSerializer<RecordWithMeta> {
     private static final Logger LOG = LoggerFactory.getLogger(RecordWithMetaSerializer.class);
 
     @Override
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RowDataSerializer.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RowDataSerializer.java
similarity index 99%
rename from flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RowDataSerializer.java
rename to flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RowDataSerializer.java
index 087362e13..d29830e7d 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RowDataSerializer.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RowDataSerializer.java
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-package org.apache.doris.flink.sink.writer;
+package org.apache.doris.flink.sink.writer.serializer;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.doris.flink.deserialization.converter.DorisRowConverter;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RowSerializer.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RowSerializer.java
similarity index 98%
rename from flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RowSerializer.java
rename to flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RowSerializer.java
index 86cad2642..3a0e61081 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/RowSerializer.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/RowSerializer.java
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-package org.apache.doris.flink.sink.writer;
+package org.apache.doris.flink.sink.writer.serializer;
 
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.table.api.DataTypes;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SimpleStringSerializer.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/SimpleStringSerializer.java
similarity index 95%
rename from flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SimpleStringSerializer.java
rename to flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/SimpleStringSerializer.java
index 682204dab..206e641ba 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/SimpleStringSerializer.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/writer/serializer/SimpleStringSerializer.java
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-package org.apache.doris.flink.sink.writer;
+package org.apache.doris.flink.sink.writer.serializer;
 
 import org.apache.flink.api.java.tuple.Tuple2;
 
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSink.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSink.java
index 66d0227ba..a961c3c58 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSink.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSink.java
@@ -23,7 +23,7 @@
 import org.apache.doris.flink.rest.RestService;
 import org.apache.doris.flink.sink.DorisSink;
 import org.apache.doris.flink.sink.batch.DorisBatchSink;
-import org.apache.doris.flink.sink.writer.RowDataSerializer;
+import org.apache.doris.flink.sink.writer.serializer.RowDataSerializer;
 import org.apache.flink.table.api.TableSchema;
 import org.apache.flink.table.connector.ChangelogMode;
 import org.apache.flink.table.connector.sink.DynamicTableSink;
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java
index 99c45ebe5..f1579b093 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java
@@ -23,7 +23,7 @@
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.DorisSink;
-import org.apache.doris.flink.sink.writer.JsonDebeziumSchemaSerializer;
+import org.apache.doris.flink.sink.writer.serializer.JsonDebeziumSchemaSerializer;
 import org.apache.doris.flink.table.DorisConfigOptions;
 import org.apache.doris.flink.tools.cdc.mysql.ParsingProcessFunction;
 import org.apache.flink.configuration.Configuration;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/CDCSchemaChangeExample.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/CDCSchemaChangeExample.java
index 62578d34f..2f491e26b 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/CDCSchemaChangeExample.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/CDCSchemaChangeExample.java
@@ -25,7 +25,7 @@
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.DorisSink;
-import org.apache.doris.flink.sink.writer.JsonDebeziumSchemaSerializer;
+import org.apache.doris.flink.sink.writer.serializer.JsonDebeziumSchemaSerializer;
 import org.apache.doris.flink.utils.DateToStringConverter;
 import org.apache.flink.api.common.eventtime.WatermarkStrategy;
 import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisIntranetAccessSinkExample.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisIntranetAccessSinkExample.java
index 61ad1dd09..b044b507c 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisIntranetAccessSinkExample.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisIntranetAccessSinkExample.java
@@ -21,7 +21,7 @@
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.DorisSink;
-import org.apache.doris.flink.sink.writer.SimpleStringSerializer;
+import org.apache.doris.flink.sink.writer.serializer.SimpleStringSerializer;
 
 import org.apache.flink.api.common.RuntimeExecutionMode;
 import org.apache.flink.api.common.functions.MapFunction;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkBatchExample.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkBatchExample.java
index 4a04d784b..0efcb4e20 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkBatchExample.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkBatchExample.java
@@ -20,7 +20,7 @@
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.batch.DorisBatchSink;
-import org.apache.doris.flink.sink.writer.SimpleStringSerializer;
+import org.apache.doris.flink.sink.writer.serializer.SimpleStringSerializer;
 import org.apache.flink.streaming.api.datastream.DataStreamSource;
 import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
 import org.apache.flink.streaming.api.functions.source.SourceFunction;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExample.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExample.java
index 9c459b730..7bc830217 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExample.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExample.java
@@ -20,7 +20,7 @@
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.DorisSink;
-import org.apache.doris.flink.sink.writer.SimpleStringSerializer;
+import org.apache.doris.flink.sink.writer.serializer.SimpleStringSerializer;
 import org.apache.flink.api.common.RuntimeExecutionMode;
 import org.apache.flink.api.common.functions.MapFunction;
 import org.apache.flink.api.common.restartstrategy.RestartStrategies;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExampleRowData.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExampleRowData.java
index 79d36c519..cd4a6f523 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExampleRowData.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkExampleRowData.java
@@ -20,7 +20,7 @@
 import org.apache.doris.flink.cfg.DorisOptions;
 import org.apache.doris.flink.sink.DorisSink;
 import org.apache.doris.flink.sink.writer.LoadConstants;
-import org.apache.doris.flink.sink.writer.RowDataSerializer;
+import org.apache.doris.flink.sink.writer.serializer.RowDataSerializer;
 import org.apache.flink.api.common.RuntimeExecutionMode;
 import org.apache.flink.api.common.functions.FlatMapFunction;
 import org.apache.flink.api.common.restartstrategy.RestartStrategies;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkMultiTableExample.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkMultiTableExample.java
index 3af014a27..bc9861cc4 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkMultiTableExample.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkMultiTableExample.java
@@ -21,7 +21,7 @@
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.batch.DorisBatchSink;
 import org.apache.doris.flink.sink.batch.RecordWithMeta;
-import org.apache.doris.flink.sink.writer.RecordWithMetaSerializer;
+import org.apache.doris.flink.sink.writer.serializer.RecordWithMetaSerializer;
 import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
 import org.apache.flink.streaming.api.functions.source.SourceFunction;
 
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkStreamMultiTableExample.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkStreamMultiTableExample.java
index 2a57b8af5..4d54f4eef 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkStreamMultiTableExample.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/DorisSinkStreamMultiTableExample.java
@@ -21,7 +21,7 @@
 import org.apache.doris.flink.cfg.DorisReadOptions;
 import org.apache.doris.flink.sink.DorisSink;
 import org.apache.doris.flink.sink.batch.RecordWithMeta;
-import org.apache.doris.flink.sink.writer.RecordWithMetaSerializer;
+import org.apache.doris.flink.sink.writer.serializer.RecordWithMetaSerializer;
 import org.apache.flink.api.common.restartstrategy.RestartStrategies;
 import org.apache.flink.api.common.time.Time;
 import org.apache.flink.configuration.Configuration;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/deserialization/convert/DorisRowConverterTest.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/deserialization/convert/DorisRowConverterTest.java
index 41f4886fb..d43338419 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/deserialization/convert/DorisRowConverterTest.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/deserialization/convert/DorisRowConverterTest.java
@@ -17,8 +17,8 @@
 package org.apache.doris.flink.deserialization.convert;
 
 import org.apache.doris.flink.deserialization.converter.DorisRowConverter;
-import org.apache.doris.flink.sink.writer.RowDataSerializer;
-import org.apache.doris.flink.sink.writer.RowDataSerializer.Builder;
+import org.apache.doris.flink.sink.writer.serializer.RowDataSerializer;
+import org.apache.doris.flink.sink.writer.serializer.RowDataSerializer.Builder;
 import org.apache.flink.table.api.DataTypes;
 import org.apache.flink.table.catalog.Column;
 import org.apache.flink.table.catalog.ResolvedSchema;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestDorisWriter.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestDorisWriter.java
index 36f98c89a..a4fb64ecc 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestDorisWriter.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestDorisWriter.java
@@ -23,6 +23,7 @@
 import org.apache.doris.flink.sink.DorisCommittable;
 import org.apache.doris.flink.sink.HttpTestUtil;
 import org.apache.doris.flink.sink.OptionUtils;
+import org.apache.doris.flink.sink.writer.serializer.SimpleStringSerializer;
 import org.apache.flink.api.connector.sink2.Sink;
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.impl.client.CloseableHttpClient;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestJsonDebeziumSchemaSerializer.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestJsonDebeziumSchemaSerializer.java
index e10a22c7e..f1e072e0a 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestJsonDebeziumSchemaSerializer.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestJsonDebeziumSchemaSerializer.java
@@ -31,6 +31,7 @@
 import org.apache.doris.flink.rest.models.Schema;
 
 import org.apache.commons.collections.CollectionUtils;
+import org.apache.doris.flink.sink.writer.serializer.JsonDebeziumSchemaSerializer;
 import org.apache.flink.shaded.guava30.com.google.common.collect.Maps;
 import org.junit.Assert;
 import org.junit.BeforeClass;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowDataSerializer.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowDataSerializer.java
index 651f701c3..6769a72fa 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowDataSerializer.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowDataSerializer.java
@@ -17,6 +17,7 @@
 
 package org.apache.doris.flink.sink.writer;
 
+import org.apache.doris.flink.sink.writer.serializer.RowDataSerializer;
 import org.apache.flink.table.types.DataType;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
diff --git a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowSerializer.java b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowSerializer.java
index d219e157b..4dfe26501 100644
--- a/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowSerializer.java
+++ b/flink-doris-connector/src/test/java/org/apache/doris/flink/sink/writer/TestRowSerializer.java
@@ -19,6 +19,7 @@
 
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.doris.flink.sink.writer.serializer.RowSerializer;
 import org.apache.flink.table.api.DataTypes;
 import org.apache.flink.table.types.DataType;
 import org.apache.flink.types.Row;