diff --git a/source/dnode/vnode/src/tsdb/tsdbMerge.c b/source/dnode/vnode/src/tsdb/tsdbMerge.c
index 9bdc0ba46a..bbe4fead4e 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMerge.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMerge.c
@@ -18,31 +18,208 @@
 typedef struct {
   STsdb  *pTsdb;
   int8_t  maxLast;
+  int64_t commitID;
   STsdbFS fs;
   struct {
     SDataFReader *pReader;
+    SArray       *aBlockIdx;
+    SArray       *aBlockL[TSDB_MAX_LAST_FILE];
   } dReader;
   struct {
     SDataFWriter *pWriter;
+    SArray       *aBlockIdx;
+    SArray       *aBlockL;
   } dWriter;
 } STsdbMerger;
 
-int32_t tsdbMerge(STsdb *pTsdb) {
-  int32_t      code = 0;
-  STsdbMerger  merger = {0};
-  STsdbMerger *pMerger = &merger;
+static int32_t tsdbMergeFileDataStart(STsdbMerger *pMerger, SDFileSet *pSet) {
+  int32_t code = 0;
+  STsdb  *pTsdb = pMerger->pTsdb;
+
+  // reader
+  code = tsdbDataFReaderOpen(&pMerger->dReader.pReader, pTsdb, pSet);
+  if (code) goto _err;
+
+  code = tsdbReadBlockIdx(pMerger->dReader.pReader, pMerger->dReader.aBlockIdx);
+  if (code) goto _err;
+
+  for (int8_t iLast = 0; iLast < pSet->nLastF; iLast++) {
+    code = tsdbReadBlockL(pMerger->dReader.pReader, iLast, pMerger->dReader.aBlockL[iLast]);
+    if (code) goto _err;
+  }
+
+  // writer
+  SHeadFile fHead = {.commitID = pMerger->commitID};
+  SDataFile fData = *pSet->pDataF;
+  SSmaFile  fSma = *pSet->pSmaF;
+  SLastFile fLast = {.commitID = pMerger->commitID};
+  SDFileSet wSet = {.diskId = pSet->diskId,
+                    .fid = pSet->fid,
+                    .nLastF = 1,
+                    .pHeadF = &fHead,
+                    .pDataF = &fData,
+                    .pSmaF = &fSma,
+                    .aLastF[0] = &fLast};
+  code = tsdbDataFWriterOpen(&pMerger->dWriter.pWriter, pTsdb, &wSet);
+  if (code) goto _err;
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb merge file data start failed since %s", TD_VID(pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+static int32_t tsdbMergeFileDataEnd(STsdbMerger *pMerger) {
+  int32_t code = 0;
+  STsdb  *pTsdb = pMerger->pTsdb;
+
+  // write aBlockIdx
+  code = tsdbWriteBlockIdx(pMerger->dWriter.pWriter, pMerger->dWriter.aBlockIdx);
+  if (code) goto _err;
+
+  // write aBlockL
+  code = tsdbWriteBlockL(pMerger->dWriter.pWriter, pMerger->dWriter.aBlockL);
+  if (code) goto _err;
+
+  // update file header
+  code = tsdbUpdateDFileSetHeader(pMerger->dWriter.pWriter);
+  if (code) goto _err;
+
+  // upsert SDFileSet
+  code = tsdbFSUpsertFSet(&pMerger->fs, &pMerger->dWriter.pWriter->wSet);
+  if (code) goto _err;
+
+  // close and sync
+  code = tsdbDataFWriterClose(&pMerger->dWriter.pWriter, 1);
+  if (code) goto _err;
+
+  if (pMerger->dReader.pReader) {
+    code = tsdbDataFReaderClose(&pMerger->dReader.pReader);
+    if (code) goto _err;
+  }
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb merge file data end failed since %s", TD_VID(pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+static int32_t tsdbMergeFileData(STsdbMerger *pMerger, SDFileSet *pSet) {
+  int32_t code = 0;
+  STsdb  *pTsdb = pMerger->pTsdb;
+
+  // start
+  code = tsdbMergeFileDataStart(pMerger, pSet);
+  if (code) goto _err;
+
+  // impl
+  while (true) {
+    if (1) break;
+    // TODO
+  }
+
+  // end
+  code = tsdbMergeFileDataEnd(pMerger);
+  if (code) goto _err;
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb merge file data failed since %s", TD_VID(pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+static int32_t tsdbStartMerge(STsdbMerger *pMerger, STsdb *pTsdb) {
+  int32_t code = 0;
 
   pMerger->pTsdb = pTsdb;
   pMerger->maxLast = TSDB_DEFAULT_LAST_FILE;
+  pMerger->commitID = ++pTsdb->pVnode->state.commitID;
   code = tsdbFSCopy(pTsdb, &pMerger->fs);
+  if (code) goto _exit;
+
+  // reader
+  pMerger->dReader.aBlockIdx = taosArrayInit(0, sizeof(SBlockIdx));
+  if (pMerger->dReader.aBlockIdx == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _exit;
+  }
+  for (int8_t iLast = 0; iLast < TSDB_MAX_LAST_FILE; iLast++) {
+    pMerger->dReader.aBlockL[iLast] = taosArrayInit(0, sizeof(SBlockL));
+    if (pMerger->dReader.aBlockL[iLast] == NULL) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+      goto _exit;
+    }
+  }
+
+  // writer
+  pMerger->dWriter.aBlockIdx = taosArrayInit(0, sizeof(SBlockIdx));
+  if (pMerger->dWriter.aBlockIdx == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _exit;
+  }
+  pMerger->dWriter.aBlockL = taosArrayInit(0, sizeof(SBlockL));
+  if (pMerger->dWriter.aBlockL == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _exit;
+  }
+
+_exit:
+  return code;
+}
+
+static int32_t tsdbEndMerge(STsdbMerger *pMerger) {
+  int32_t code = 0;
+  STsdb  *pTsdb = pMerger->pTsdb;
+
+  code = tsdbFSCommit1(pTsdb, &pMerger->fs);
   if (code) goto _err;
 
-  for (int32_t iSet = 0; iSet < taosArrayGetSize(pMerger->fs.aDFileSet); iSet++) {
-    SDFileSet *pSet = (SDFileSet *)taosArrayGet(pMerger->fs.aDFileSet, iSet);
-    if (pSet->nLastF < pMerger->maxLast) continue;
-
-    // do merge the file
+  taosThreadRwlockWrlock(&pTsdb->rwLock);
+  code = tsdbFSCommit2(pTsdb, &pMerger->fs);
+  if (code) {
+    taosThreadRwlockUnlock(&pTsdb->rwLock);
+    goto _err;
   }
+  taosThreadRwlockUnlock(&pTsdb->rwLock);
+
+  // writer
+  taosArrayDestroy(pMerger->dWriter.aBlockL);
+  taosArrayDestroy(pMerger->dWriter.aBlockIdx);
+
+  // reader
+  for (int8_t iLast = 0; iLast < TSDB_MAX_LAST_FILE; iLast++) {
+    taosArrayDestroy(pMerger->dReader.aBlockL[iLast]);
+  }
+  taosArrayDestroy(pMerger->dReader.aBlockIdx);
+  tsdbFSDestroy(&pMerger->fs);
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d, tsdb end merge failed since %s", TD_VID(pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+int32_t tsdbMerge(STsdb *pTsdb) {
+  int32_t     code = 0;
+  STsdbMerger merger = {0};
+
+  code = tsdbStartMerge(&merger, pTsdb);
+  if (code) goto _err;
+
+  for (int32_t iSet = 0; iSet < taosArrayGetSize(merger.fs.aDFileSet); iSet++) {
+    SDFileSet *pSet = (SDFileSet *)taosArrayGet(merger.fs.aDFileSet, iSet);
+    if (pSet->nLastF < merger.maxLast) continue;
+
+    code = tsdbMergeFileData(&merger, pSet);
+    if (code) goto _err;
+  }
+
+  code = tsdbEndMerge(&merger);
+  if (code) goto _err;
 
   return code;