diff --git a/src/storage/memtable/ob_multi_source_data.cpp b/src/storage/memtable/ob_multi_source_data.cpp
index 22eb1865d..264825e8c 100644
--- a/src/storage/memtable/ob_multi_source_data.cpp
+++ b/src/storage/memtable/ob_multi_source_data.cpp
@@ -159,7 +159,8 @@ void ObMultiSourceData::inner_release_rest_unit_data(
 int ObMultiSourceData::inner_mark_unit_sync_finish(
     const int64_t list_pos,
     const int64_t unit_version,
-    bool save_last_flag)
+    bool save_last_flag,
+    const int unsync_cnt_for_multi_data)
 {
   int ret = OB_SUCCESS;
   if (OB_UNLIKELY(list_pos < 0 || list_pos >= MAX_LIST_COUNT)) {
@@ -176,6 +177,7 @@ int ObMultiSourceData::inner_mark_unit_sync_finish(
           KPC(last_item));
     } else {
       last_item->set_sync_finish(true);
+      last_item->set_unsync_cnt_for_multi_data(unsync_cnt_for_multi_data);
 
       if (save_last_flag) {
         (void)inner_release_rest_unit_data(list_pos, unit_version);
diff --git a/src/storage/memtable/ob_multi_source_data.h b/src/storage/memtable/ob_multi_source_data.h
index c2569b41b..9306492d4 100644
--- a/src/storage/memtable/ob_multi_source_data.h
+++ b/src/storage/memtable/ob_multi_source_data.h
@@ -97,6 +97,7 @@ public:
     TRANS_LOG(INFO, "unsync_cnt_for_multi_data dec", KPC(this));
   }
   int get_unsync_cnt_for_multi_data() const { return unsynced_cnt_for_multi_data_; }
+  void set_unsync_cnt_for_multi_data(const int unsynced_cnt_for_multi_data) { unsynced_cnt_for_multi_data_ = unsynced_cnt_for_multi_data; }
   virtual bool is_save_last() const { return true; } // only store one data unit with sync_finish=true
   virtual int64_t get_version() const { return common::OB_INVALID_VERSION; } // have to implement for unit list type
   VIRTUAL_TO_STRING_KV(K_(is_tx_end),
@@ -142,7 +143,8 @@ private:
   int inner_mark_unit_sync_finish(
       const int64_t unit_type,
       const int64_t unit_version,
-      bool save_last_flag);
+      bool save_last_flag,
+      const int unsync_cnt_for_multi_data);
   void inner_release_rest_unit_data(
       const int64_t list_pos,
       const int64_t unit_version);
@@ -209,7 +211,7 @@ int ObMultiSourceData::save_multi_source_data_unit_in_list(const T *const src, b
       (void)inner_release_rest_unit_data(list_pos, src->get_version());
     }
   } else if (src->is_sync_finish()
-      && OB_FAIL(inner_mark_unit_sync_finish(list_pos, src->get_version(), src->is_save_last()))) { // mark finish
+      && OB_FAIL(inner_mark_unit_sync_finish(list_pos, src->get_version(), src->is_save_last(), src->get_unsync_cnt_for_multi_data()))) { // mark finish
     TRANS_LOG(WARN, "failed to makr unit sync finish", K(ret), K(list_pos), KPC(src));
   }
 
diff --git a/unittest/storage/memtable/test_memtable_basic.cpp b/unittest/storage/memtable/test_memtable_basic.cpp
index ebff8bf49..06cb16388 100644
--- a/unittest/storage/memtable/test_memtable_basic.cpp
+++ b/unittest/storage/memtable/test_memtable_basic.cpp
@@ -31,6 +31,8 @@
 #include "share/scn.h"
 #include "storage/ls/ob_ls.h"
 #include "storage/tx_storage/ob_ls_map.h"
+#include "share/schema/ob_column_schema.h"
+#include "storage/ob_storage_schema.h"
 
 namespace oceanbase
 {
@@ -191,6 +193,57 @@ public:
     return OB_SUCCESS;
   }
 
+  void prepare_schema(share::schema::ObTableSchema &table_schema)
+  {
+    int ret = OB_SUCCESS;
+    int64_t micro_block_size = 16 * 1024;
+    const uint64_t tenant_id = 1;
+    const uint64_t table_id = 777;
+    share::schema::ObColumnSchemaV2 column;
+
+    //generate data table schema
+    table_schema.reset();
+    ret = table_schema.set_table_name("test_merge_multi_version");
+    ASSERT_EQ(OB_SUCCESS, ret);
+    table_schema.set_tenant_id(tenant_id);
+    table_schema.set_tablegroup_id(1);
+    table_schema.set_database_id(1);
+    table_schema.set_table_id(table_id);
+    table_schema.set_rowkey_column_num(3);
+    table_schema.set_max_used_column_id(6);
+    table_schema.set_block_size(micro_block_size);
+    table_schema.set_compress_func_name("none");
+    table_schema.set_row_store_type(FLAT_ROW_STORE);
+    //init column
+    char name[OB_MAX_FILE_NAME_LENGTH];
+    memset(name, 0, sizeof(name));
+    const int64_t column_ids[] = {16,17,20,21,22,23,24,29};
+    for(int64_t i = 0; i < 6; ++i){
+      ObObjType obj_type = ObIntType;
+      const int64_t column_id = column_ids[i];
+
+      if (i == 1) {
+        obj_type = ObVarcharType;
+      }
+      column.reset();
+      column.set_table_id(table_id);
+      column.set_column_id(column_id);
+      sprintf(name, "test%020ld", i);
+      ASSERT_EQ(OB_SUCCESS, column.set_column_name(name));
+      column.set_data_type(obj_type);
+      column.set_collation_type(CS_TYPE_UTF8MB4_GENERAL_CI);
+      column.set_data_length(10);
+      if (i < 3) {
+        column.set_rowkey_position(i + 1);
+      } else {
+        column.set_rowkey_position(0);
+      }
+      COMMON_LOG(INFO, "add column", K(i), K(column));
+      ASSERT_EQ(OB_SUCCESS, table_schema.add_column(column));
+    }
+    COMMON_LOG(INFO, "dump stable schema", K(table_schema));
+  }
+
   void reset_iter_param()
   {
     iter_param_.reset();
@@ -449,6 +502,29 @@ TEST_F(TestMemtable, multi_key)
   print(mvcc_row2);
 }
 
+TEST_F(TestMemtable, test_unsync_cnt_for_multi_data)
+{
+  ObMemtable memtable;
+  EXPECT_EQ(OB_SUCCESS, init_memtable(memtable));
+  share::schema::ObTableSchema table_schema;
+  ObStorageSchema storage_schema;
+  bool is_callback = true;
+  bool for_replay = true;
+  share::SCN scn;
+
+  ASSERT_EQ(OB_SUCCESS, scn.convert_from_ts(100));
+  prepare_schema(table_schema);
+  ASSERT_EQ(OB_SUCCESS, storage_schema.init(allocator_, table_schema, lib::Worker::CompatMode::MYSQL));
+
+  storage_schema.set_sync_finish(false);
+  ASSERT_EQ(OB_SUCCESS, memtable.save_multi_source_data_unit(&storage_schema, scn, !for_replay, memtable::MemtableRefOp::INC_REF, !is_callback));
+  ASSERT_EQ(1, storage_schema.get_unsync_cnt_for_multi_data());
+
+  storage_schema.set_sync_finish(true);
+  ASSERT_EQ(OB_SUCCESS, memtable.save_multi_source_data_unit(&storage_schema, scn, !for_replay, memtable::MemtableRefOp::DEC_REF, is_callback));
+  ASSERT_EQ(0, storage_schema.get_unsync_cnt_for_multi_data());
+}
+
 
 }// end of oceanbase
 
diff --git a/unittest/storage/test_storage_schema.cpp b/unittest/storage/test_storage_schema.cpp
index 7ac39f3a3..cf425b3d2 100644
--- a/unittest/storage/test_storage_schema.cpp
+++ b/unittest/storage/test_storage_schema.cpp
@@ -299,7 +299,8 @@ TEST_F(TestStorageSchema, test_storage_schema_list_in_memtable)
   ASSERT_EQ(OB_ERR_UNEXPECTED, source_data.inner_mark_unit_sync_finish(
       list_pos,
       storage_schema.get_version(), // invalid version
-      true));
+      true,
+      0));
 
   ASSERT_EQ(OB_SUCCESS, source_data.save_multi_source_data_unit(&storage_schema, is_callback));
 
@@ -310,7 +311,8 @@ TEST_F(TestStorageSchema, test_storage_schema_list_in_memtable)
   ASSERT_EQ(OB_SUCCESS, source_data.inner_mark_unit_sync_finish(
       list_pos,
       storage_schema.get_version(),
-      true));
+      true,
+      0));
   ASSERT_EQ(OB_SUCCESS, source_data.get_multi_source_data_unit(&read_storage_schema, &allocator_));
   ASSERT_EQ(true, judge_storage_schema_equal(storage_schema, read_storage_schema));
   ASSERT_EQ(true, source_data.has_multi_source_data_unit(pos));
@@ -332,7 +334,8 @@ TEST_F(TestStorageSchema, test_storage_schema_list_in_memtable)
   ASSERT_EQ(OB_ERR_UNEXPECTED, source_data.inner_mark_unit_sync_finish(
       list_pos,
       storage_schema.get_version() + 1, // invalid version
-      true));
+      true,
+      0));
 
   storage_schema.set_sync_finish(false);
   ASSERT_EQ(OB_SUCCESS, source_data.save_multi_source_data_unit(&storage_schema, true));