diff --git a/src/storage/backup/ob_backup_factory.cpp b/src/storage/backup/ob_backup_factory.cpp
index bca80fb07..d5e95723a 100644
--- a/src/storage/backup/ob_backup_factory.cpp
+++ b/src/storage/backup/ob_backup_factory.cpp
@@ -275,6 +275,16 @@ void ObLSBackupFactory::free(ObBackupTabletCtx *&ctx)
   OB_DELETE(ObBackupTabletCtx, ObModIds::BACKUP, ctx);
 }
 
+void ObLSBackupFactory::free(ObBackupOrderedMacroBlockIndexIterator *&iterator)
+{
+  OB_DELETE(ObBackupOrderedMacroBlockIndexIterator, ObModIds::BACKUP, iterator);
+}
+
+void ObLSBackupFactory::free(ObBackupUnorderedMacroBlockIndexIterator *&iterator)
+{
+  OB_DELETE(ObBackupUnorderedMacroBlockIndexIterator, ObModIds::BACKUP, iterator);
+}
+
 void ObLSBackupFactory::free(ObBackupSSTableSecMetaIterator *&iterator)
 {
   OB_DELETE(ObBackupSSTableSecMetaIterator, ObModIds::BACKUP, iterator);
diff --git a/src/storage/backup/ob_backup_factory.h b/src/storage/backup/ob_backup_factory.h
index 430ab3e9a..30ff8f1ab 100644
--- a/src/storage/backup/ob_backup_factory.h
+++ b/src/storage/backup/ob_backup_factory.h
@@ -55,7 +55,8 @@ public:
   static void free(ObBackupSSTableSecMetaIterator *&iterator);
   static void free(ObBackupWrapperIODevice *device);
   static void free(ObIBackupTabletMetaIterator *device);
-
+  static void free(ObBackupUnorderedMacroBlockIndexIterator *&iterator);
+  static void free(ObBackupOrderedMacroBlockIndexIterator *&iterator);
 private:
   template <class IT>
   static void component_free(IT *component)
diff --git a/src/storage/backup/ob_backup_index_merger.cpp b/src/storage/backup/ob_backup_index_merger.cpp
index 79f40fcda..d8e219ba9 100644
--- a/src/storage/backup/ob_backup_index_merger.cpp
+++ b/src/storage/backup/ob_backup_index_merger.cpp
@@ -1929,6 +1929,10 @@ int ObBackupUnorderdMacroBlockIndexMerger::alloc_merge_iter_(const bool tenant_l
       LOG_WARN("failed to init macro block index iterator", K(ret), K(merge_param), K(ls_id), K(turn_id));
     } else {
       iter = tmp_iter;
+      tmp_iter = NULL;
+    }
+    if (OB_NOT_NULL(tmp_iter)) {
+      ObLSBackupFactory::free(tmp_iter);
     }
   }
   return ret;
@@ -1992,8 +1996,12 @@ int ObBackupUnorderdMacroBlockIndexMerger::prepare_prev_backup_set_index_iter_(
     LOG_WARN("failed to init backup macro range index iterator", K(ret), K(merge_param), K(prev_backup_set_desc), K(prev_tenant_index_retry_id));
   } else {
     iter = tmp_iter;
+    tmp_iter = NULL;
     LOG_INFO("prepare prev backup set index iter", K(prev_backup_set_desc), K(merge_param));
   }
+  if(OB_NOT_NULL(tmp_iter)){
+    ObLSBackupFactory::free(tmp_iter);
+  }
   return ret;
 }