diff --git a/src/storage/direct_load/ob_direct_load_external_multi_partition_table.cpp b/src/storage/direct_load/ob_direct_load_external_multi_partition_table.cpp
index 9201fe7e2e..06ca8a0cf1 100644
--- a/src/storage/direct_load/ob_direct_load_external_multi_partition_table.cpp
+++ b/src/storage/direct_load/ob_direct_load_external_multi_partition_table.cpp
@@ -41,7 +41,13 @@ bool ObDirectLoadExternalMultiPartitionTableBuildParam::is_valid() const
  */
 
 ObDirectLoadExternalMultiPartitionTableBuilder::ObDirectLoadExternalMultiPartitionTableBuilder()
-  : allocator_("TLD_EMPTBuilder"), row_count_(0), is_closed_(false), is_inited_(false)
+  : allocator_("TLD_EMPTBuilder"),
+    fragment_array_(),
+    total_row_count_(0),
+    fragment_row_count_(0),
+    max_data_block_size_(0),
+    is_closed_(false),
+    is_inited_(false)
 {
 }
 
@@ -62,11 +68,8 @@ int ObDirectLoadExternalMultiPartitionTableBuilder::init(
   } else {
     param_ = param;
     allocator_.set_tenant_id(MTL_ID());
-    int64_t dir_id = -1;
-    if (OB_FAIL(param.file_mgr_->alloc_dir(dir_id))) {
-      LOG_WARN("fail to alloc dir", KR(ret));
-    } else if (OB_FAIL(param.file_mgr_->alloc_file(dir_id, file_handle_))) {
-      LOG_WARN("fail to alloc fragment", KR(ret));
+    if (OB_FAIL(alloc_tmp_file())) {
+      LOG_WARN("fail to alloc tmp file", KR(ret));
     } else if (OB_FAIL(external_writer_.init(param_.table_data_desc_.external_data_block_size_,
                                              param_.table_data_desc_.compressor_type_,
                                              param_.extra_buf_, param_.extra_buf_size_))) {
@@ -103,7 +106,62 @@ int ObDirectLoadExternalMultiPartitionTableBuilder::append_row(const ObTabletID
     } else if (OB_FAIL(external_writer_.write_item(row_))) {
       LOG_WARN("fail to write item", KR(ret));
     } else {
-      ++row_count_;
+      ++fragment_row_count_;
+      ++total_row_count_;
+    }
+    if (OB_SUCC(ret) && (external_writer_.get_file_size() >= MAX_TMP_FILE_SIZE)) {
+      if (OB_FAIL(switch_fragment())) {
+        LOG_WARN("fail to switch fragment", KR(ret));
+      }
+    }
+  }
+  return ret;
+}
+
+int ObDirectLoadExternalMultiPartitionTableBuilder::alloc_tmp_file()
+{
+  int ret = OB_SUCCESS;
+  int64_t dir_id = -1;
+  if (OB_FAIL(param_.file_mgr_->alloc_dir(dir_id))) {
+    LOG_WARN("fail to alloc dir", KR(ret));
+  } else if (OB_FAIL(param_.file_mgr_->alloc_file(dir_id, file_handle_))) {
+    LOG_WARN("fail to alloc file", KR(ret));
+  }
+  return ret;
+}
+
+int ObDirectLoadExternalMultiPartitionTableBuilder::generate_fragment()
+{
+  int ret = OB_SUCCESS;
+  ObDirectLoadExternalFragment fragment;
+  fragment.file_size_ = external_writer_.get_file_size();
+  fragment.row_count_ = fragment_row_count_;
+  fragment.max_data_block_size_ = external_writer_.get_max_block_size();
+  if (OB_FAIL(fragment.file_handle_.assign(file_handle_))) {
+    LOG_WARN("fail to assign file handle", KR(ret));
+  } else if (OB_FAIL(fragment_array_.push_back(fragment))) {
+    LOG_WARN("fail to push back fragment", KR(ret));
+  } else if (max_data_block_size_ < fragment.max_data_block_size_) {
+    max_data_block_size_ = fragment.max_data_block_size_;
+  }
+  return ret;
+}
+
+int ObDirectLoadExternalMultiPartitionTableBuilder::switch_fragment()
+{
+  int ret = OB_SUCCESS;
+  if (OB_FAIL(external_writer_.close())) {
+    LOG_WARN("fail to close external writer", KR(ret));
+  } else if (OB_FAIL(generate_fragment())) {
+    LOG_WARN("fail to generate fragment", KR(ret));
+  } else if (OB_FAIL(alloc_tmp_file())) {
+    LOG_WARN("fail to alloc tmp file", KR(ret));
+  } else {
+    external_writer_.reuse();
+    if (OB_FAIL(external_writer_.open(file_handle_))) {
+      LOG_WARN("fail to open file", KR(ret));
+    } else {
+      fragment_row_count_ = 0;
     }
   }
   return ret;
@@ -118,13 +176,18 @@ int ObDirectLoadExternalMultiPartitionTableBuilder::close()
   } else if (OB_UNLIKELY(is_closed_)) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("direct load external multi partition table is closed", KR(ret));
-  } else {
-    if (OB_FAIL(external_writer_.close())) {
-      LOG_WARN("fail to close external writer", KR(ret));
+  } else if (OB_FAIL(external_writer_.close())) {
+    LOG_WARN("fail to close external writer", KR(ret));
+  } else if ((fragment_row_count_ > 0) || fragment_array_.empty()) {
+    if (OB_FAIL(generate_fragment())) {
+      LOG_WARN("failed to generate fragment", KR(ret));
     } else {
-      is_closed_ = true;
+      fragment_row_count_ = 0;
     }
   }
+  if (OB_SUCC(ret)) {
+    is_closed_ = true;
+  }
   return ret;
 }
 
@@ -142,18 +205,11 @@ int ObDirectLoadExternalMultiPartitionTableBuilder::get_tables(
     ObDirectLoadExternalTableCreateParam create_param;
     create_param.tablet_id_ = 0; //因为包含了所有的tablet_id，设置为一个无效值
     create_param.data_block_size_ = param_.table_data_desc_.external_data_block_size_;
-    create_param.row_count_ = row_count_;
-    create_param.max_data_block_size_ = external_writer_.get_max_block_size();
-    ObDirectLoadExternalFragment fragment;
-    fragment.file_size_ = external_writer_.get_file_size();
-    fragment.row_count_ = row_count_;
-    fragment.max_data_block_size_ = external_writer_.get_max_block_size();
-    if (OB_FAIL(fragment.file_handle_.assign(file_handle_))) {
-      LOG_WARN("fail to assign file handle", KR(ret));
-    } else if (OB_FAIL(create_param.fragments_.push_back(fragment))) {
-      LOG_WARN("fail to push back", KR(ret));
-    }
-    if (OB_SUCC(ret)) {
+    create_param.row_count_ = total_row_count_;
+    create_param.max_data_block_size_ = max_data_block_size_;
+    if (OB_FAIL(create_param.fragments_.assign(fragment_array_))) {
+      LOG_WARN("fail to assign fragment array", KR(ret), K(fragment_array_));
+    } else {
       ObDirectLoadExternalTable *external_table = nullptr;
       if (OB_ISNULL(external_table = OB_NEWx(ObDirectLoadExternalTable, (&allocator)))) {
         ret = OB_ALLOCATE_MEMORY_FAILED;
diff --git a/src/storage/direct_load/ob_direct_load_external_multi_partition_table.h b/src/storage/direct_load/ob_direct_load_external_multi_partition_table.h
index 0bed5e2d27..ddf5dd4834 100644
--- a/src/storage/direct_load/ob_direct_load_external_multi_partition_table.h
+++ b/src/storage/direct_load/ob_direct_load_external_multi_partition_table.h
@@ -9,12 +9,12 @@
 #include "storage/direct_load/ob_direct_load_external_multi_partition_row.h"
 #include "storage/direct_load/ob_direct_load_i_table.h"
 #include "storage/direct_load/ob_direct_load_table_data_desc.h"
+#include "storage/direct_load/ob_direct_load_external_fragment.h"
 
 namespace oceanbase
 {
 namespace storage
 {
-
 struct ObDirectLoadExternalMultiPartitionTableBuildParam
 {
 public:
@@ -35,6 +35,7 @@ class ObDirectLoadExternalMultiPartitionTableBuilder : public ObIDirectLoadParti
 {
   typedef ObDirectLoadExternalMultiPartitionRow RowType;
   typedef ObDirectLoadExternalBlockWriter<RowType> ExternalWriter;
+  static const int64_t MAX_TMP_FILE_SIZE = 1LL * 1024 * 1024 * 1024; // 1GiB
 public:
   ObDirectLoadExternalMultiPartitionTableBuilder();
   virtual ~ObDirectLoadExternalMultiPartitionTableBuilder();
@@ -42,16 +43,23 @@ public:
   int append_row(const common::ObTabletID &tablet_id,
                  const blocksstable::ObDatumRow &datum_row) override;
   int close() override;
-  int64_t get_row_count() const override { return row_count_; }
+  int64_t get_row_count() const override { return total_row_count_; }
   int get_tables(common::ObIArray<ObIDirectLoadPartitionTable *> &table_array,
                  common::ObIAllocator &allocator) override;
+private:
+  int alloc_tmp_file();
+  int generate_fragment();
+  int switch_fragment();
 private:
   ObDirectLoadExternalMultiPartitionTableBuildParam param_;
   common::ObArenaAllocator allocator_;
   ObDirectLoadTmpFileHandle file_handle_;
   ExternalWriter external_writer_;
   RowType row_;
-  int64_t row_count_;
+  ObDirectLoadExternalFragmentArray fragment_array_;
+  int64_t total_row_count_;
+  int64_t fragment_row_count_;
+  int64_t max_data_block_size_;
   bool is_closed_;
   bool is_inited_;
   DISALLOW_COPY_AND_ASSIGN(ObDirectLoadExternalMultiPartitionTableBuilder);
diff --git a/src/storage/direct_load/ob_direct_load_mem_loader.cpp b/src/storage/direct_load/ob_direct_load_mem_loader.cpp
index 86a3278ea7..0895d8a3ea 100644
--- a/src/storage/direct_load/ob_direct_load_mem_loader.cpp
+++ b/src/storage/direct_load/ob_direct_load_mem_loader.cpp
@@ -40,9 +40,10 @@ int ObDirectLoadMemLoader::add_table(ObIDirectLoadPartitionTable *table)
     if (OB_ISNULL(external_table = dynamic_cast<ObDirectLoadExternalTable *>(table))) {
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("unexpected table", KR(ret), KPC(table));
-    } else if (OB_UNLIKELY(external_table->get_fragments().count() != 1)) {
+    } else if (OB_UNLIKELY(external_table->get_fragments().count() <= 0)) {
       ret = OB_INVALID_ARGUMENT;
-      LOG_WARN("files handle should only have one handle", KR(ret));
+      LOG_WARN("files handle should have at least one handle",
+          KR(ret), K(external_table->get_fragments().count()));
     } else if (OB_FAIL(fragments_.push_back(external_table->get_fragments()))) {
       LOG_WARN("fail to push back", KR(ret));
     }
@@ -58,7 +59,7 @@ int ObDirectLoadMemLoader::work()
   ChunkType *chunk = nullptr;
   RowType row;
   for (int64_t i = 0; OB_SUCC(ret) && i < fragments_.count(); i++) {
-    const ObDirectLoadExternalFragment &fragment = fragments_.at(i);
+    ObDirectLoadExternalFragment &fragment = fragments_.at(i);
     ExternalReader external_reader;
     if (OB_FAIL(external_reader.init(mem_ctx_->table_data_desc_.external_data_block_size_,
                                      fragment.max_data_block_size_,
@@ -117,6 +118,9 @@ int ObDirectLoadMemLoader::work()
         }
       }
     }
+    if (OB_SUCC(ret)) {
+      fragment.reset();
+    }
   }
 
   if (OB_SUCC(ret)) {