diff --git a/source/dnode/vnode/src/tsdb/tsdbCompact.c b/source/dnode/vnode/src/tsdb/tsdbCompact.c
index d98e8e9ce346bb0e66243f2eea54f7274432ced4..0a27abdbf97bc310781c5c3fc81824c06115d79d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCompact.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCompact.c
@@ -53,19 +53,27 @@ typedef struct STsdbDataIter {
 #define TSDB_DATA_ITER_FROM_RBTN(N) ((STsdbDataIter *)((char *)N - offsetof(STsdbDataIter, n)))
 
 typedef struct {
-  STsdb         *pTsdb;
-  int64_t        cid;
-  int32_t        maxRows;
-  int32_t        minRows;
-  STsdbFS        fs;
-  int32_t        fid;
-  SDFileSet     *pDFileSet;
+  STsdb     *pTsdb;
+  int64_t    cid;
+  int32_t    maxRows;
+  int32_t    minRows;
+  STsdbFS    fs;
+  int32_t    fid;
+  SDFileSet *pDFileSet;
+
+  // Reader
   SDataFReader  *pReader;
   STsdbDataIter *iterList;  // list of iterators
   SRBTree        rtree;
   STsdbDataIter *pIter;
   SBlockData     bData;
   SSkmInfo       tbSkm;
+
+  // Writer
+  SDataFWriter *pWriter;
+  SArray       *aBlockIdx;  // SArray<SBlockIdx>
+  SMapData      mDataBlk;   // SMapData<SDataBlk>
+  SArray       *aSttBlk;    // SArray<SSttBlk>
 } STsdbCompactor;
 
 #define TSDB_FLG_DEEP_COMPACT 0x1
@@ -141,7 +149,7 @@ _exit:
   _clear_exit:
     *ppIter = NULL;
     if (pIter) {
-      tBlockDataDestroy(&pDataDIter->bData, 1);
+      tBlockDataDestroy(&pDataDIter->bData);
       tMapDataClear(&pDataDIter->mDataBlk);
       taosArrayDestroy(pDataDIter->aBlockIdx);
       taosMemoryFree(pIter);
@@ -191,7 +199,7 @@ _exit:
   _clear_exit:
     *ppIter = NULL;
     if (pIter) {
-      tBlockDataDestroy(&pSttDIter->bData, 1);
+      tBlockDataDestroy(&pSttDIter->bData);
       taosArrayDestroy(pSttDIter->aSttBlk);
       taosMemoryFree(pIter);
     }
@@ -559,6 +567,33 @@ static int32_t tsdbOpenCompactor(STsdbCompactor *pCompactor) {
   pCompactor->pIter = NULL;
   tBlockDataReset(&pCompactor->bData);
 
+  // open writers
+  SDFileSet fSet = {0};  // TODO
+  code = tsdbDataFWriterOpen(&pCompactor->pWriter, pTsdb, NULL);
+  TSDB_CHECK_CODE(code, lino, _exit);
+
+  if (pCompactor->aBlockIdx == NULL) {
+    pCompactor->aBlockIdx = taosArrayInit(0, sizeof(SBlockIdx));
+    if (pCompactor->aBlockIdx == NULL) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+      TSDB_CHECK_CODE(code, lino, _exit);
+    }
+  } else {
+    taosArrayClear(pCompactor->aBlockIdx);
+  }
+
+  tMapDataReset(&pCompactor->mDataBlk);
+
+  if (pCompactor->aSttBlk == NULL) {
+    pCompactor->aSttBlk = taosArrayInit(0, sizeof(SSttBlk));
+    if (pCompactor->aSttBlk == NULL) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+      TSDB_CHECK_CODE(code, lino, _exit);
+    }
+  } else {
+    taosArrayClear(pCompactor->aSttBlk);
+  }
+
 _exit:
   if (code) {
     tsdbError("vgId:%d %s failed at line %d since %s", TD_VID(pTsdb->pVnode), __func__, lino, tstrerror(code));
@@ -666,6 +701,27 @@ int32_t tsdbCompact(STsdb *pTsdb, int32_t flag) {
       TSDB_CHECK_CODE(code, lino, _exit);
     }
 
+    if (pCompactor->bData.nRow > 0) {
+      // write again
+    }
+
+    code = tsdbWriteSttBlk(pCompactor->pWriter, pCompactor->aSttBlk);
+    TSDB_CHECK_CODE(code, lino, _exit);
+
+    if (pCompactor->mDataBlk.nItem > 0) {
+      SBlockIdx *pBlockIdx = taosArrayReserve(pCompactor->aBlockIdx, 1);
+      if (pBlockIdx == NULL) {
+        code = TSDB_CODE_OUT_OF_MEMORY;
+        TSDB_CHECK_CODE(code, lino, _exit);
+      }
+
+      code = tsdbWriteDataBlk(pCompactor->pWriter, &pCompactor->mDataBlk, pBlockIdx);
+      TSDB_CHECK_CODE(code, lino, _exit);
+    }
+
+    code = tsdbWriteBlockIdx(pCompactor->pWriter, pCompactor->aBlockIdx);
+    TSDB_CHECK_CODE(code, lino, _exit);
+
     tsdbCloseCompactor(pCompactor);
   }