diff --git a/src/util/src/tskiplist.c b/src/util/src/tskiplist.c
index 1760919b053ffcd1ea9703b1b7a51bd023d49547..77f643a2c7ea2840439e4d21f173bf78ac571869 100644
--- a/src/util/src/tskiplist.c
+++ b/src/util/src/tskiplist.c
@@ -472,7 +472,7 @@ void tSkipListDoInsert(SSkipList *pSkipList, SSkipListNode **forward, int32_t le
       SL_GET_FORWARD_POINTER(x, i) = pNode;
     } else {
       SL_GET_FORWARD_POINTER(pSkipList->pHead, i) = pNode;
-      SL_GET_BACKWARD_POINTER(pSkipList->pHead, i) = (pSkipList->pHead);
+      // SL_GET_BACKWARD_POINTER(pSkipList->pHead, i) = (pSkipList->pHead);
     }
   }
 }
diff --git a/src/vnode/tsdb/inc/tsdbFile.h b/src/vnode/tsdb/inc/tsdbFile.h
index 0c85c5ef46548df5fd6d1d5866c2ddff411040a7..6c42d4aa155addfd1daa8d9d98319dec9bff748d 100644
--- a/src/vnode/tsdb/inc/tsdbFile.h
+++ b/src/vnode/tsdb/inc/tsdbFile.h
@@ -82,6 +82,19 @@ int         tsdbOpenFile(SFile *pFile, int oflag);
 int         tsdbCloseFile(SFile *pFile); SFileGroup *tsdbOpenFilesForCommit(STsdbFileH *pFileH, int fid);
 int         tsdbRemoveFileGroup(STsdbFileH *pFile, int fid);
 
+#define TSDB_FGROUP_ITER_FORWARD 0
+#define TSDB_FGROUP_ITER_BACKWARD 1
+typedef struct {
+  int         numOfFGroups;
+  SFileGroup *base;
+  SFileGroup *pFileGroup;
+  int         direction;
+} SFileGroupIter;
+
+void        tsdbInitFileGroupIter(STsdbFileH *pFileH, SFileGroupIter *pIter, int direction);
+void        tsdbSeekFileGroupIter(SFileGroupIter *pIter, int fid);
+SFileGroup *tsdbGetFileGroupNext(SFileGroupIter *pIter);
+
 typedef struct {
   int32_t len;
   int32_t offset;
diff --git a/src/vnode/tsdb/src/tsdbFile.c b/src/vnode/tsdb/src/tsdbFile.c
index bfdd998c2271b006484c51329df2ad8d7c4dec1f..d6964112e7fef975aaf0b34c67faefe268fdab4e 100644
--- a/src/vnode/tsdb/src/tsdbFile.c
+++ b/src/vnode/tsdb/src/tsdbFile.c
@@ -22,6 +22,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "tutil.h"
 #include "tsdbFile.h"
 
 const char *tsdbFileSuffix[] = {
@@ -133,6 +134,51 @@ int tsdbRemoveFileGroup(STsdbFileH *pFileH, int fid) {
   return 0;
 }
 
+void tsdbInitFileGroupIter(STsdbFileH *pFileH, SFileGroupIter *pIter, int direction) {
+  pIter->direction = direction;
+  pIter->base = pFileH->fGroup;
+  pIter->numOfFGroups = pFileH->numOfFGroups;
+  if (pFileH->numOfFGroups == 0){
+    pIter->pFileGroup = NULL;
+  } else {
+    if (direction == TSDB_FGROUP_ITER_FORWARD) {
+      pIter->pFileGroup = pFileH->fGroup;
+    } else {
+      pIter->pFileGroup = pFileH->fGroup + pFileH->numOfFGroups - 1;
+    }
+  }
+}
+
+void tsdbSeekFileGroupIter(SFileGroupIter *pIter, int fid) {
+  int flags = (pIter->direction == TSDB_FGROUP_ITER_FORWARD) ? TD_GE : TD_LE;
+  void *ptr = taosbsearch(&fid, pIter->base, sizeof(SFileGroup), pIter->numOfFGroups, compFGroupKey, flags);
+  if (ptr == NULL) {
+    pIter->pFileGroup = NULL;
+  } else {
+    pIter->pFileGroup = (SFileGroup *)ptr;
+  }
+}
+
+SFileGroup *tsdbGetFileGroupNext(SFileGroupIter *pIter) {
+  SFileGroup *ret = pIter->pFileGroup;
+  if (ret == NULL) return NULL;
+
+  if (pIter->direction = TSDB_FGROUP_ITER_FORWARD) {
+    if (pIter->pFileGroup + 1 == pIter->base + pIter->numOfFGroups) {
+      pIter->pFileGroup = NULL;
+    } else {
+      pIter->pFileGroup += 1;
+    }
+  } else {
+    if (pIter->pFileGroup - 1 == pIter->base) {
+      pIter->pFileGroup = NULL;
+    } else {
+      pIter->pFileGroup -= 1;
+    }
+  }
+  return ret;
+}
+
 int tsdbLoadDataBlock(SFile *pFile, SCompBlock *pStartBlock, int numOfBlocks, SDataCols *pCols, SCompData *pCompData) {
   SCompBlock *pBlock = pStartBlock;
   for (int i = 0; i < numOfBlocks; i++) {
diff --git a/src/vnode/tsdb/tests/tsdbTests.cpp b/src/vnode/tsdb/tests/tsdbTests.cpp
index 12311db68ecccf9f797e6465983f47349a2f9aba..6cfe0e626dd217b70597c2f75f2f7a575472d1e3 100644
--- a/src/vnode/tsdb/tests/tsdbTests.cpp
+++ b/src/vnode/tsdb/tests/tsdbTests.cpp
@@ -49,8 +49,8 @@ TEST(TsdbTest, DISABLED_tableEncodeDecode) {
   ASSERT_EQ(memcmp(pTable->schema, tTable->schema, sizeof(STSchema) + sizeof(STColumn) * nCols), 0);
 }
 
-TEST(TsdbTest, DISABLED_createRepo) {
-// TEST(TsdbTest, createRepo) {
+// TEST(TsdbTest, DISABLED_createRepo) {
+TEST(TsdbTest, createRepo) {
   STsdbCfg config;
 
   // 1. Create a tsdb repository