diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index d5e715068f..1a95d90a21 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -90,9 +90,10 @@ typedef struct SDataFReader SDataFReader;
 typedef struct SDelFWriter SDelFWriter;
 
 int32_t tsdbDelFWriterOpen(SDelFWriter **ppWriter, SDelFile *pFile, STsdb *pTsdb);
-int32_t tsdbDelFWriterClose(SDelFWriter *pWriter);
+int32_t tsdbDelFWriterClose(SDelFWriter *pWriter, int8_t sync);
 int32_t tsdbWriteDelData(SDelFWriter *pWriter, SDelData *pDelData, uint8_t **ppBuf, SDelIdxItem *pItem);
 int32_t tsdbWriteDelIdx(SDelFWriter *pWriter, SDelIdx *pDelIdx, uint8_t **ppBuf);
+int32_t tsdbUpdateDelFileHdr(SDelFWriter *pWriter, uint8_t **ppBuf);
 
 // SDelFReader
 typedef struct SDelFReader SDelFReader;
@@ -154,6 +155,8 @@ int32_t tGetDelIdx(uint8_t *p, SDelIdx *pDelIdx);
 int32_t tPutDelData(uint8_t *p, SDelData *pDelData);
 int32_t tGetDelData(uint8_t *p, SDelData *pDelData);
 
+int32_t tPutDelFileHdr(uint8_t *p, SDelFile *pDelFile);
+int32_t tGetDelFileHdr(uint8_t *p, SDelFile *pDelFile);
 // structs
 typedef struct {
   int   minFid;
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index 7705af3e2f..4245eaf5ea 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -22,6 +22,8 @@ struct SCommitter {
   uint8_t *pBuf1;
   uint8_t *pBuf2;
   uint8_t *pBuf3;
+  uint8_t *pBuf4;
+  uint8_t *pBuf5;
   /* commit data */
   int32_t minutes;
   int8_t  precision;
@@ -171,6 +173,8 @@ static int32_t tsdbCommitDelStart(SCommitter *pCommitter) {
   SDelFile  *pDelFileR = NULL;  // TODO
   SDelFile  *pDelFileW = NULL;  // TODO
 
+  // load old
+  pCommitter->oDelIdx = (SDelIdx){0};
   if (pDelFileR) {
     code = tsdbDelFReaderOpen(&pCommitter->pDelFReader, pDelFileR, pTsdb, NULL);
     if (code) {
@@ -183,6 +187,8 @@ static int32_t tsdbCommitDelStart(SCommitter *pCommitter) {
     }
   }
 
+  // prepare new
+  pCommitter->nDelIdx = (SDelIdx){0};
   code = tsdbDelFWriterOpen(&pCommitter->pDelFWriter, pDelFileW, pTsdb);
   if (code) {
     goto _err;
@@ -250,12 +256,17 @@ static int32_t tsdbCommitDelImpl(SCommitter *pCommitter) {
 static int32_t tsdbCommitDelEnd(SCommitter *pCommitter) {
   int32_t code = 0;
 
-  code = tsdbWriteDelIdx(pCommitter->pDelFWriter, &pCommitter->nDelIdx, &pCommitter->pBuf3);
+  code = tsdbWriteDelIdx(pCommitter->pDelFWriter, &pCommitter->nDelIdx, NULL);
   if (code) {
     goto _err;
   }
 
-  code = tsdbDelFWriterClose(pCommitter->pDelFWriter);
+  code = tsdbUpdateDelFileHdr(pCommitter->pDelFWriter, NULL);
+  if (code) {
+    goto _err;
+  }
+
+  code = tsdbDelFWriterClose(pCommitter->pDelFWriter, 1);
   if (code) {
     goto _err;
   }
@@ -268,6 +279,7 @@ static int32_t tsdbCommitDelEnd(SCommitter *pCommitter) {
   return code;
 
 _err:
+  tsdbError("vgId:%d commit del end failed since %s", TD_VID(pCommitter->pTsdb->pVnode), tstrerror(code));
   return code;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index 7a44fd799f..e14d09e6c1 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -114,9 +114,25 @@ _err:
   return code;
 }
 
-int32_t tsdbDelFWriterClose(SDelFWriter *pWriter) {
+int32_t tsdbDelFWriterClose(SDelFWriter *pWriter, int8_t sync) {
   int32_t code = 0;
-  // TODO
+
+  // sync
+  if (sync && taosFsyncFile(pWriter->pWriteH) < 0) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
+  // close
+  if (taosCloseFile(&pWriter->pWriteH) < 0) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d failed to close del file writer since %s", TD_VID(pWriter->pTsdb->pVnode), tstrerror(code));
   return code;
 }
 
@@ -129,35 +145,87 @@ int32_t tsdbWriteDelData(SDelFWriter *pWriter, SDelData *pDelData, uint8_t **ppB
 }
 
 int32_t tsdbWriteDelIdx(SDelFWriter *pWriter, SDelIdx *pDelIdx, uint8_t **ppBuf) {
-  int32_t code = 0;
-  int64_t size;
+  int32_t  code = 0;
+  int64_t  size;
+  int64_t  n;
+  uint8_t *pBuf = NULL;
 
-  size = tPutDelIdx(NULL, pDelIdx) + sizeof(TSCKSUM);
+  // prepare
+  pDelIdx->delimiter = TSDB_FILE_DLMT;
+  // pDelIdx->nOffset = (todo)
 
   // alloc
+  if (!ppBuf) ppBuf = &pBuf;
+  size = tPutDelIdx(NULL, pDelIdx) + sizeof(TSCKSUM);
   code = tsdbRealloc(ppBuf, size);
   if (code) {
     goto _err;
   }
 
-  // encode
-  tPutDelIdx(*ppBuf, pDelIdx);
-
-  // checksum
+  // build
+  n = tPutDelIdx(*ppBuf, pDelIdx);
   taosCalcChecksumAppend(0, *ppBuf, size);
 
+  ASSERT(n + sizeof(TSCKSUM) == size);
+
+  // write
+  n = taosWriteFile(pWriter->pWriteH, *ppBuf, size);
+  if (n < 0) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
+  ASSERT(n == size);
+
+  // update
+  pWriter->pFile->offset = pWriter->pFile->size;
+  pWriter->pFile->size += size;
+
+  tsdbFree(pBuf);
+  return code;
+
+_err:
+  tsdbError("vgId:%d failed to write del idx since %s", TD_VID(pWriter->pTsdb->pVnode), tstrerror(code));
+  tsdbFree(pBuf);
+  return code;
+}
+
+int32_t tsdbUpdateDelFileHdr(SDelFWriter *pWriter, uint8_t **ppBuf) {
+  int32_t  code = 0;
+  uint8_t *pBuf = NULL;
+  int64_t  size = TSDB_FHDR_SIZE;
+  int64_t  n;
+
+  // alloc
+  if (!ppBuf) ppBuf = &pBuf;
+  code = tsdbRealloc(ppBuf, size);
+  if (code) goto _err;
+
+  // build
+  memset(*ppBuf, 0, size);
+  n = tPutDelFileHdr(*ppBuf, pWriter->pFile);
+  taosCalcChecksumAppend(0, *ppBuf, size);
+
+  ASSERT(n <= size - sizeof(TSCKSUM));
+
+  // seek
+  if (taosLSeekFile(pWriter->pWriteH, 0, SEEK_SET) < 0) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
   // write
   if (taosWriteFile(pWriter->pWriteH, *ppBuf, size) < size) {
     code = TAOS_SYSTEM_ERROR(errno);
     goto _err;
   }
 
-  pWriter->pFile->offset = pWriter->pFile->size;
-  pWriter->pFile->size += size;
-
+  tsdbFree(pBuf);
   return code;
 
 _err:
+  tsdbError("vgId:%d failed to update del file header since %s", TD_VID(pWriter->pTsdb->pVnode), tstrerror(code));
+  tsdbFree(pBuf);
   return code;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index 0fa4e17b6e..df6d13ff7f 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -130,4 +130,30 @@ int32_t tGetDelData(uint8_t *p, SDelData *pDelData) {
   n += tGetBinary(p, &pDelData->pData, &pDelData->nData);
 
   return n;
-}
\ No newline at end of file
+}
+
+int32_t tPutDelFileHdr(uint8_t *p, SDelFile *pDelFile) {
+  int32_t n = 0;
+
+  n += tPutI64(p ? p + n : p, pDelFile->minKey);
+  n += tPutI64(p ? p + n : p, pDelFile->maxKey);
+  n += tPutI64v(p ? p + n : p, pDelFile->minVersion);
+  n += tPutI64v(p ? p + n : p, pDelFile->maxVersion);
+  n += tPutI64v(p ? p + n : p, pDelFile->size);
+  n += tPutI64v(p ? p + n : p, pDelFile->offset);
+
+  return n;
+}
+
+int32_t tGetDelFileHdr(uint8_t *p, SDelFile *pDelFile) {
+  int32_t n = 0;
+
+  n += tGetI64(p, &pDelFile->minKey);
+  n += tGetI64(p, &pDelFile->maxKey);
+  n += tGetI64v(p, &pDelFile->minVersion);
+  n += tGetI64v(p, &pDelFile->maxVersion);
+  n += tGetI64v(p, &pDelFile->size);
+  n += tGetI64v(p, &pDelFile->offset);
+
+  return n;
+}