diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 1a95d90a21..7f554a1a5f 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -31,18 +31,21 @@ extern "C" {
 #define tsdbDebug(...) do { if (tsdbDebugFlag & DEBUG_DEBUG) { taosPrintLog("TSDB ", DEBUG_DEBUG, tsdbDebugFlag, __VA_ARGS__); }} while(0)
 #define tsdbTrace(...) do { if (tsdbDebugFlag & DEBUG_TRACE) { taosPrintLog("TSDB ", DEBUG_TRACE, tsdbDebugFlag, __VA_ARGS__); }} while(0)
 // clang-format on
-
-typedef struct TSDBROW TSDBROW;
-typedef struct TSDBKEY TSDBKEY;
-typedef struct TABLEID TABLEID;
-typedef struct SDelOp  SDelOp;
+typedef struct TSDBROW      TSDBROW;
+typedef struct TSDBKEY      TSDBKEY;
+typedef struct TABLEID      TABLEID;
+typedef struct SDelOp       SDelOp;
+typedef struct SDelDataItem SDelDataItem;
+typedef struct SDelData     SDelData;
+typedef struct SDelIdxItem  SDelIdxItem;
+typedef struct SDelIdx      SDelIdx;
+typedef struct STbData      STbData;
+typedef struct SMemTable    SMemTable;
+typedef struct STbDataIter  STbDataIter;
+typedef struct SMergeInfo   SMergeInfo;
+typedef struct STable       STable;
 
 // tsdbMemTable ==============================================================================================
-typedef struct STbData     STbData;
-typedef struct SMemTable   SMemTable;
-typedef struct STbDataIter STbDataIter;
-typedef struct SMergeInfo  SMergeInfo;
-typedef struct STable      STable;
 
 // SMemTable
 int32_t tsdbMemTableCreate(STsdb *pTsdb, SMemTable **ppMemTable);
@@ -75,10 +78,6 @@ int32_t tsdbFSStart(STsdbFS *pFS);
 int32_t tsdbFSEnd(STsdbFS *pFS, int8_t rollback);
 
 // tsdbReaderWriter.c ==============================================================================================
-typedef struct SDelDataItem SDelDataItem;
-typedef struct SDelData     SDelData;
-typedef struct SDelIdxItem  SDelIdxItem;
-typedef struct SDelIdx      SDelIdx;
 
 // SDataFWriter
 typedef struct SDataFWriter SDataFWriter;
@@ -149,14 +148,19 @@ void    tsdbFree(uint8_t *pBuf);
 int32_t tTABLEIDCmprFn(const void *p1, const void *p2);
 int32_t tsdbKeyCmprFn(const void *p1, const void *p2);
 
+// SDelIdx
+int32_t tDelIdxGetSize(SDelIdx *pDelIdx);
+int32_t tDelIdxGetItem(SDelIdx *pDelIdx, int32_t idx, SDelIdxItem *pItem);
 int32_t tPutDelIdx(uint8_t *p, SDelIdx *pDelIdx);
 int32_t tGetDelIdx(uint8_t *p, SDelIdx *pDelIdx);
 
+// SDelData
 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 4245eaf5ea..81f02d7ed0 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -210,44 +210,34 @@ static int32_t tsdbCommitDelImpl(SCommitter *pCommitter) {
   int32_t    iTbData = 0;
   int32_t    nTbData = taosArrayGetSize(pMemTable->aTbData);
   int32_t    iDelIdx = 0;
-  int32_t    nDelIdx;  // TODO
-  int32_t    c;
+  int32_t    nDelIdx = 0;  // TODO
   STbData   *pTbData = NULL;
   SDelIdx   *pDelIdx = NULL;
+  SDelIdx    delIdx;
+
+  if (iTbData < nTbData) {
+    pTbData = (STbData *)taosArrayGetP(pMemTable->aTbData, iTbData);
+  }
+  if (iDelIdx < nDelIdx) {
+    // tIMapGet();
+    pDelIdx = &delIdx;
+  }
 
   while (iTbData < nTbData || iDelIdx < nDelIdx) {
-    // if (iTbData < nTbData) {
-    //   pTbData = (STbData *)taosArrayGetP(pMemTable->aTbData, iTbData);
-    // } else {
-    //   pTbData = NULL;
-    // }
-    // if (iDelIdx < nDelIdx) {
-    //   // pDelIdx = ; // TODO
-    // } else {
-    //   pDelIdx = NULL;
-    // }
+    if (pTbData && pDelIdx) {
+    } else {
+    }
 
-    // if (pTbData && pDelIdx) {
-    //   c = tTABLEIDCmprFn(pTbData, pDelIdx);
-    //   if (c == 0) {
-    //     iTbData++;
-    //     iDelIdx++;
-    //   } else if (c < 0) {
-    //     iTbData++;
-    //     pDelIdx = NULL;
-    //   } else {
-    //     iDelIdx++;
-    //     pTbData = NULL;
-    //   }
-    // } else {
-    //   if (pTbData) {
-    //     iTbData++;
-    //   } else {
-    //     iDelIdx++;
-    //   }
-    // }
+    // start
+    // 1. load table del if exist
 
-    // TODO: commit with the pTbData and pDelIdx
+    // impl
+    while (1) {
+      // do merge
+    }
+
+    // end
+    // tsdbWriteDelData
   }
 
   return code;
diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index e14d09e6c1..d222fc5b3d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -136,11 +136,45 @@ _err:
   return code;
 }
 
-int32_t tsdbWriteDelData(SDelFWriter *pWriter, SDelData *pDelData, uint8_t **ppBuf, SDelIdxItem *pItem) {
-  int32_t code = 0;
-  int64_t size;
+int32_t tsdbWriteDelDta(SDelFWriter *pWriter, SDelData *pDelData, uint8_t **ppBuf) {
+  int32_t  code = 0;
+  uint8_t *pBuf = NULL;
+  int64_t  size;
+  int64_t  n;
 
-  // TODO
+  // prepare
+
+  // alloc
+  if (!ppBuf) ppBuf = &pBuf;
+  size = tPutDelData(NULL, pDelData) + sizeof(TSCKSUM);
+  code = tsdbRealloc(ppBuf, size);
+  if (code) goto _err;
+
+  // build
+  n = tPutDelData(*ppBuf, pDelData);
+  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 data since %s", TD_VID(pWriter->pTsdb->pVnode), tstrerror(code));
+  tsdbFree(pBuf);
   return code;
 }
 
@@ -158,9 +192,7 @@ int32_t tsdbWriteDelIdx(SDelFWriter *pWriter, SDelIdx *pDelIdx, uint8_t **ppBuf)
   if (!ppBuf) ppBuf = &pBuf;
   size = tPutDelIdx(NULL, pDelIdx) + sizeof(TSCKSUM);
   code = tsdbRealloc(ppBuf, size);
-  if (code) {
-    goto _err;
-  }
+  if (code) goto _err;
 
   // build
   n = tPutDelIdx(*ppBuf, pDelIdx);
@@ -291,10 +323,14 @@ int32_t tsdbDelFReaderClose(SDelFReader *pReader) {
   int32_t code = 0;
 
   if (pReader) {
-    taosCloseFile(&pReader->pReadH);
+    if (taosCloseFile(&pReader->pReadH) < 0) {
+      code = TAOS_SYSTEM_ERROR(errno);
+      goto _exit;
+    }
     taosMemoryFree(pReader);
   }
 
+_exit:
   return code;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index df6d13ff7f..3fb484e52f 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -88,6 +88,19 @@ int32_t tsdbKeyCmprFn(const void *p1, const void *p2) {
   return 0;
 }
 
+// SDelIdx ======================================================
+int32_t tDelIdxGetSize(SDelIdx *pDelIdx) {
+  int32_t code = 0;
+  // TODO
+  return code;
+}
+
+int32_t tDelIdxGetItem(SDelIdx *pDelIdx, int32_t idx, SDelIdxItem *pItem) {
+  int32_t code = 0;
+  // TODO
+  return code;
+}
+
 int32_t tPutDelIdx(uint8_t *p, SDelIdx *pDelIdx) {
   int32_t n = 0;