diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 227bbd798e04da6f16be0c37109df7c7d7631d24..98a50418303e1407a298b30d36081b1436e240cf 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -55,6 +55,10 @@ typedef struct SReadH       SReadH;
 
 #define TSDB_MAX_SUBBLOCKS 8
 
+#define HAS_NONE  ((int8_t)0x1)
+#define HAS_NULL  ((int8_t)0x2)
+#define HAS_VALUE ((int8_t)0x4)
+
 // tsdbMemTable ==============================================================================================
 
 // SMemTable
@@ -185,6 +189,10 @@ int32_t tPutBlock(uint8_t *p, void *ph);
 int32_t tGetBlock(uint8_t *p, void *ph);
 int32_t tBlockCmprFn(const void *p1, const void *p2);
 
+// SBlockCol
+int32_t tPutBlockCol(uint8_t *p, void *ph);
+int32_t tGetBlockCol(uint8_t *p, void *ph);
+
 // SBlockData
 #define tsdbBlockDataCreate() ((SBlockData){0})
 void    tsdbBlockDataClear(SBlockData *pBlockData);
@@ -306,9 +314,28 @@ struct SBlockIdx {
   int64_t size;
 };
 
+struct SMapData {
+  int32_t  nItem;
+  uint8_t  flag;
+  uint8_t *pOfst;
+  uint32_t nData;
+  uint8_t *pData;
+  uint8_t *pBuf;
+};
+
 typedef struct {
+  int16_t cid;
+  int8_t  type;
+  int8_t  flag;
   int64_t offset;
   int64_t size;
+} SBlockCol;
+
+typedef struct {
+  int64_t  offset;
+  int64_t  ksize;
+  int64_t  bsize;
+  SMapData mBlockCol;  // SMapData<SBlockCol>
 } SSubBlock;
 
 struct SBlock {
@@ -317,9 +344,11 @@ struct SBlock {
   int8_t    last;
   int8_t    hasDup;
   int8_t    nSubBlock;
-  SSubBlock sBlocks[TSDB_MAX_SUBBLOCKS];
+  SSubBlock aSubBlock[TSDB_MAX_SUBBLOCKS];
 };
 
+int a = sizeof(SBlock);
+
 struct SAggrBlkCol {
   int16_t colId;
   int16_t maxIndex;
@@ -393,15 +422,6 @@ struct SDelFile {
   int64_t offset;
 };
 
-struct SMapData {
-  int32_t  nItem;
-  uint8_t  flag;
-  uint8_t *pOfst;
-  uint32_t nData;
-  uint8_t *pData;
-  uint8_t *pBuf;
-};
-
 typedef struct {
   int16_t colId;
   int16_t maxIndex;
diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index 856a076e195c1a1415050ce46edef850ae635319..84c63a8192ab496f5cc0a48be5b1e15dfb2708ec 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -723,8 +723,48 @@ _err:
 
 int32_t tsdbWriteBlockData(SDataFWriter *pWriter, SBlockData *pBlockData, uint8_t **ppBuf, SBlockIdx *pBlockIdx,
                            SBlock *pBlock) {
-  int32_t code = 0;
-  // TODO
+  int32_t    code = 0;
+  SSubBlock *pSubBlock = &pBlock->aSubBlock[pBlock->nSubBlock++];
+  SBlockCol  bCol;
+
+  pSubBlock->offset = 0;
+  pSubBlock->ksize = 0;
+  pSubBlock->bsize = 0;
+  tMapDataClear(&pSubBlock->mBlockCol);
+
+  // TSDBKEY
+
+  // other columns
+  for (int32_t iCol = 0; iCol < pBlockData->nCol; iCol++) {
+    SColData *pColData = &pBlockData->aColData[iCol];
+
+    ASSERT(pColData->flags);
+
+    if (pColData->flags == HAS_NONE) continue;
+
+    bCol.cid = pColData->cid;
+    bCol.type = pColData->type;
+    bCol.flag = pColData->flags;
+
+    if (pColData->flags != HAS_NULL) {
+      if (pColData->flags != HAS_VALUE) {
+        // handle bitmap
+      }
+
+      // handle real data
+
+      // bCol.offset = ;
+      // bCol.size = ;
+    }
+
+    code = tMapDataPutItem(&pSubBlock->mBlockCol, &bCol, tPutBlockCol);
+    if (code) goto _err;
+  }
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d write block data failed since %s", pWriter->pTsdb, tstrerror(code));
   return code;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index e63dbb8ed0a3b161ee2c43610bcf63b6bb4883b1..181208f73cb731a16e060f414944a60f4180ffa3 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -277,14 +277,14 @@ int32_t tGetBlockIdx(uint8_t *p, void *ph) {
 // SBlock ======================================================
 int32_t tPutBlock(uint8_t *p, void *ph) {
   int32_t n = 0;
-  ASSERT(0);
+  SBlock *pBlock = (SBlock *)ph;
   // TODO
   return n;
 }
 
 int32_t tGetBlock(uint8_t *p, void *ph) {
   int32_t n = 0;
-  ASSERT(0);
+  SBlock *pBlock = (SBlock *)ph;
   // TODO
   return n;
 }
@@ -303,6 +303,43 @@ int32_t tBlockCmprFn(const void *p1, const void *p2) {
   return 0;
 }
 
+// SBlockCol ======================================================
+int32_t tPutBlockCol(uint8_t *p, void *ph) {
+  int32_t    n = 0;
+  SBlockCol *pBlockCol = (SBlockCol *)ph;
+
+  ASSERT(pBlockCol->flag && (pBlockCol->flag != HAS_NONE));
+
+  n += tPutI16v(p ? p + n : p, pBlockCol->cid);
+  n += tPutI8(p ? p + n : p, pBlockCol->type);
+  n += tPutI8(p ? p + n : p, pBlockCol->flag);
+
+  if (pBlockCol->flag != HAS_NULL) {
+    n += tPutI64v(p ? p + n : p, pBlockCol->offset);
+    n += tPutI64v(p ? p + n : p, pBlockCol->size);
+  }
+
+  return n;
+}
+
+int32_t tGetBlockCol(uint8_t *p, void *ph) {
+  int32_t    n = 0;
+  SBlockCol *pBlockCol = (SBlockCol *)ph;
+
+  n += tGetI16v(p + n, &pBlockCol->cid);
+  n += tGetI8(p + n, &pBlockCol->type);
+  n += tGetI8(p + n, &pBlockCol->flag);
+
+  ASSERT(pBlockCol->flag && (pBlockCol->flag != HAS_NONE));
+
+  if (pBlockCol->flag != HAS_NULL) {
+    n += tGetI64v(p + n, &pBlockCol->offset);
+    n += tGetI64v(p + n, &pBlockCol->size);
+  }
+
+  return n;
+}
+
 // SDelIdx ======================================================
 int32_t tPutDelIdx(uint8_t *p, void *ph) {
   SDelIdx *pDelIdx = (SDelIdx *)ph;