diff --git a/src/common/inc/tdataformat.h b/src/common/inc/tdataformat.h
index b1dbe6b3d7ea79a79f9a8f39fbc91d60468c6a28..706fdeff987ac5fa58ad71b85a2d85c8f8f7586e 100644
--- a/src/common/inc/tdataformat.h
+++ b/src/common/inc/tdataformat.h
@@ -248,6 +248,7 @@ typedef struct {
 #define kvRowCpy(dst, r) memcpy((dst), (r), kvRowLen(r))
 #define kvRowColVal(r, colIdx) POINTER_SHIFT(kvRowValues(r), (colIdx)->offset)
 #define kvRowColIdxAt(r, i) (kvRowColIdx(r) + (i))
+#define kvRowFree(r) tfree(r)
 
 SKVRow tdKVRowDup(SKVRow row);
 SKVRow tdSetKVRowDataOfCol(SKVRow row, int16_t colId, int8_t type, void *value);
@@ -314,57 +315,6 @@ static FORCE_INLINE int tdAddColToKVRow(SKVRowBuilder *pBuilder, int16_t colId,
   return 0;
 }
 
-// ----------------- Tag row structure
-
-/* A tag row, the format is like below:
-+----------+----------------------------------------------------------------+
-| STagRow  | STagCol | STagCol | STagCol | STagCol | ...| STagCol | STagCol |
-+----------+----------------------------------------------------------------+
-
-pData
-+----------+----------------------------------------------------------------+
-| value 1     | value 2 |  value 3     | value 4       | ....|value n       |
-+----------+----------------------------------------------------------------+
-
- */
-
-#define TD_TAG_ROW_HEAD_SIZE sizeof(int16_t)
-
-#define tagRowNum(r) (*(int16_t *)(r))
-#define tagRowArray(r) POINTER_SHIFT(r, TD_TAG_ROW_HEAD_SIZE)
-//#define dataRowKey(r) (*(TSKEY *)(dataRowTuple(r)))
-//#define dataRowSetLen(r, l) (dataRowLen(r) = (l))
-//#define dataRowCpy(dst, r) memcpy((dst), (r), dataRowLen(r))
-//#define dataRowMaxBytesFromSchema(s) (schemaTLen(s) + TD_DATA_ROW_HEAD_SIZE)
-
-typedef struct {
-  int16_t  colId;  // column ID
-  int16_t  colType;
-  uint16_t offset;  // to store value for numeric col or offset for binary/Nchar
-} STagCol;
-
-typedef struct {
-  int32_t  len;
-  void *   pData;  // Space to store the tag value
-  uint16_t dataLen;
-  int16_t  ncols;  // Total columns allocated
-  STagCol  tagCols[];
-} STagRow;
-
-#define tagColSize(r) (sizeof(STagCol) + r.colLen)
-
-int       tdSetTagCol(SDataRow row, void *value, int16_t len, int8_t type,
-                      int16_t colId);                   // insert tag value and update all the information
-int       tdDeleteTagCol(SDataRow row, int16_t colId);  // delete tag value and update all the information
-void *    tdQueryTagByID(SDataRow row, int16_t colId, int16_t *type);  // if find tag, 0, else return -1;
-int       tdAppendTagColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int16_t colId);
-SDataRow  tdTagRowDup(SDataRow row);
-void      tdFreeTagRow(SDataRow row);
-SDataRow  tdTagRowDecode(SDataRow row);
-int       tdTagRowCpy(SDataRow dst, SDataRow src);
-void *    tdNewTagRowFromSchema(STSchema *pSchema, int16_t numofTags);
-STSchema *tdGetSchemaFromData(SDataRow *row);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/common/src/tdataformat.c b/src/common/src/tdataformat.c
index e4ee5cc4bc8684e0ecb06ab409e18ca765327eec..7a35d5fb69d53673f64faa29241ddd6348b19c19 100644
--- a/src/common/src/tdataformat.c
+++ b/src/common/src/tdataformat.c
@@ -152,152 +152,6 @@ SDataRow tdNewDataRowFromSchema(STSchema *pSchema) {
   return row;
 }
 
-int tdSetTagCol(SDataRow row, void *value, int16_t len, int8_t type,
-                int16_t colId) {  // insert/update tag value and update all the information
-  ASSERT(((STagRow *)row)->pData != NULL);
-  // STagCol * stCol = tdQueryTagColByID()
-
-  return 0;
-};
-
-int tdDeleteTagCol(SDataRow row, int16_t colId) {  // delete tag value and update all the information
-  // todo
-  return 0;
-};
-
-static int compTagId(const void *key1, const void *key2) {
-  if (((STagCol *)key1)->colId > ((STagCol *)key2)->colId) {
-    return 1;
-  } else if (((STagCol *)key1)->colId == ((STagCol *)key2)->colId) {
-    return 0;
-  } else {
-    return -1;
-  }
-}
-
-/**
- * Find tag structure by colId, if find, return tag structure, else return NULL;
- */
-STagCol *tdQueryTagColByID(SDataRow row, int16_t colId, int flags) {  // if find tag, 0, else return -1;
-  ASSERT(((STagRow *)row)->pData != NULL);
-  STagCol *pBase = ((STagRow *)row)->tagCols;
-  int16_t  nCols = ((STagRow *)row)->ncols;
-  STagCol  key = {colId, 0, 0};
-  STagCol *stCol = taosbsearch(&key, pBase, nCols, sizeof(STagCol), compTagId, flags);
-  return stCol;
-};
-
-/**
- * Find tag value by colId, if find, return tag value, else return NULL;
- */
-void *tdQueryTagByID(SDataRow row, int16_t colId, int16_t *type) {
-  ASSERT(((STagRow *)row)->pData != NULL);
-  STagCol *pBase = ((STagRow *)row)->tagCols;
-  int16_t  nCols = ((STagRow *)row)->ncols;
-  STagCol  key = {colId, 0, 0};
-  STagCol *stCol = taosbsearch(&key, pBase, nCols, sizeof(STagCol), compTagId, TD_EQ);
-  if (NULL == stCol) {
-    return NULL;
-  }
-
-  void *pData = ((STagRow *)row)->pData;
-  *type = stCol->colType;
-
-  return pData + stCol->offset;
-};
-
-int tdAppendTagColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int16_t colId) {
-  ASSERT(value != NULL);
-  // ASSERT(bytes-2 == varDataTLen(value));
-  ASSERT(row != NULL);
-  STagRow *pTagrow = row;
-  pTagrow->tagCols[pTagrow->ncols].colId = colId;
-  pTagrow->tagCols[pTagrow->ncols].colType = type;
-  pTagrow->tagCols[pTagrow->ncols].offset = pTagrow->dataLen;
-
-  switch (type) {
-    case TSDB_DATA_TYPE_BINARY:
-    case TSDB_DATA_TYPE_NCHAR:
-      memcpy((char *)pTagrow->pData + pTagrow->dataLen, value, varDataTLen(value));
-      pTagrow->dataLen += varDataTLen(value);
-      break;
-    default:
-      memcpy((char *)pTagrow->pData + pTagrow->dataLen, value, TYPE_BYTES[type]);
-      pTagrow->dataLen += TYPE_BYTES[type];
-      break;
-  }
-
-  pTagrow->ncols++;
-
-  return 0;
-};
-
-void *tdNewTagRowFromSchema(STSchema *pSchema, int16_t numofTags) {
-  int32_t size = sizeof(STagRow) + numofTags * sizeof(STagCol);
-
-  STagRow *row = malloc(size);
-  if (row == NULL) return NULL;
-
-  int32_t datasize = pSchema->tlen;
-  row->pData = malloc(datasize);
-  if (NULL == row->pData) {
-    free(row);
-    return NULL;
-  }
-
-  row->len = size;
-  row->dataLen = 0;
-  row->ncols = 0;
-  return row;
-}
-/**
- * free tag row
- */
-
-void tdFreeTagRow(SDataRow row) {
-  if (row) {
-    free(((STagRow *)row)->pData);
-    free(row);
-  }
-}
-
-SDataRow tdTagRowDup(SDataRow row) {
-  STagRow *trow = malloc(dataRowLen(row));
-  if (trow == NULL) return NULL;
-
-  dataRowCpy(trow, row);
-  trow->pData = malloc(trow->dataLen);
-  if (NULL == trow->pData) {
-    free(trow);
-    return NULL;
-  }
-  memcpy(trow->pData, ((STagRow *)row)->pData, trow->dataLen);
-  return trow;
-}
-
-SDataRow tdTagRowDecode(SDataRow row) {
-  STagRow *trow = malloc(dataRowLen(row));
-  if (trow == NULL) return NULL;
-
-  dataRowCpy(trow, row);
-  trow->pData = malloc(trow->dataLen);
-  if (NULL == trow->pData) {
-    free(trow);
-    return NULL;
-  }
-  char *pData = (char *)row + dataRowLen(row);
-  memcpy(trow->pData, pData, trow->dataLen);
-  return trow;
-}
-
-int tdTagRowCpy(SDataRow dst, SDataRow src) {
-  if (src == NULL) return -1;
-
-  dataRowCpy(dst, src);
-  void *pData = dst + dataRowLen(src);
-  memcpy(pData, ((STagRow *)src)->pData, ((STagRow *)src)->dataLen);
-  return 0;
-}
 /**
  * Free the SDataRow object
  */
diff --git a/src/inc/tsdb.h b/src/inc/tsdb.h
index c758d3aea4340f57140eea0d8f3f5ae95f94a2c6..fcfb6c6add38b7d3bdc10576206a7694b196e398 100644
--- a/src/inc/tsdb.h
+++ b/src/inc/tsdb.h
@@ -101,7 +101,7 @@ int  tsdbInitTableCfg(STableCfg *config, ETableType type, uint64_t uid, int32_t
 int  tsdbTableSetSuperUid(STableCfg *config, uint64_t uid);
 int  tsdbTableSetSchema(STableCfg *config, STSchema *pSchema, bool dup);
 int  tsdbTableSetTagSchema(STableCfg *config, STSchema *pSchema, bool dup);
-int  tsdbTableSetTagValue(STableCfg *config, SDataRow row, bool dup);
+int  tsdbTableSetTagValue(STableCfg *config, SKVRow row, bool dup);
 int  tsdbTableSetName(STableCfg *config, char *name, bool dup);
 int  tsdbTableSetSName(STableCfg *config, char *sname, bool dup);
 int  tsdbTableSetStreamSql(STableCfg *config, char *sql, bool dup);
diff --git a/src/tsdb/inc/tsdbMain.h b/src/tsdb/inc/tsdbMain.h
index 9dd5136c959f30bc56804b87f9f63692d1cc0eca..e1b85ae99d383915d376aaeec17b59305c480562 100644
--- a/src/tsdb/inc/tsdbMain.h
+++ b/src/tsdb/inc/tsdbMain.h
@@ -76,7 +76,7 @@ typedef struct STable {
   int32_t        sversion;
   STSchema *     schema;
   STSchema *     tagSchema;
-  SDataRow       tagVal;
+  SKVRow         tagVal;
   SMemTable *    mem;
   SMemTable *    imem;
   void *         pIndex;         // For TSDB_SUPER_TABLE, it is the skiplist index
diff --git a/src/tsdb/src/tsdbMain.c b/src/tsdb/src/tsdbMain.c
index 9c8e57d18aa6bcc98d9acb562bd83f070ff97281..af4b9608b6074a2d57274a6cc4e9e5d909eb6b76 100644
--- a/src/tsdb/src/tsdbMain.c
+++ b/src/tsdb/src/tsdbMain.c
@@ -506,11 +506,11 @@ int tsdbTableSetTagSchema(STableCfg *config, STSchema *pSchema, bool dup) {
   return 0;
 }
 
-int tsdbTableSetTagValue(STableCfg *config, SDataRow row, bool dup) {
+int tsdbTableSetTagValue(STableCfg *config, SKVRow row, bool dup) {
   if (config->type != TSDB_CHILD_TABLE) return -1;
 
   if (dup) {
-    config->tagValues = tdDataRowDup(row);
+    config->tagValues = tdKVRowDup(row);
   } else {
     config->tagValues = row;
   }
@@ -557,7 +557,7 @@ int tsdbTableSetStreamSql(STableCfg *config, char *sql, bool dup) {
 void tsdbClearTableCfg(STableCfg *config) {
   if (config->schema) tdFreeSchema(config->schema);
   if (config->tagSchema) tdFreeSchema(config->tagSchema);
-  if (config->tagValues) tdFreeDataRow(config->tagValues);
+  if (config->tagValues) kvRowFree(config->tagValues);
   tfree(config->name);
   tfree(config->sname);
   tfree(config->sql);
diff --git a/src/tsdb/src/tsdbMeta.c b/src/tsdb/src/tsdbMeta.c
index 0d9e6a9cf8c6c5438be023def71657eaaa2e9da6..e1a9770df67a732a9502d1e1486fa269c8d197f4 100644
--- a/src/tsdb/src/tsdbMeta.c
+++ b/src/tsdb/src/tsdbMeta.c
@@ -47,8 +47,7 @@ void tsdbEncodeTable(STable *pTable, char *buf, int *contLen) {
     ptr = tdEncodeSchema(ptr, pTable->schema);
     ptr = tdEncodeSchema(ptr, pTable->tagSchema);
   } else if (pTable->type == TSDB_CHILD_TABLE) {
-    tdTagRowCpy(ptr, pTable->tagVal);
-    ptr = POINTER_SHIFT(ptr, dataRowLen(pTable->tagVal) + ((STagRow *)pTable->tagVal)->dataLen);
+    ptr = tdEncodeKVRow(ptr, pTable->tagVal);
   } else {
     ptr = tdEncodeSchema(ptr, pTable->schema);
   }
@@ -94,8 +93,7 @@ STable *tsdbDecodeTable(void *cont, int contLen) {
     pTable->schema = tdDecodeSchema(&ptr);
     pTable->tagSchema = tdDecodeSchema(&ptr);
   } else if (pTable->type == TSDB_CHILD_TABLE) {
-    pTable->tagVal = tdTagRowDecode(ptr);
-    ptr = POINTER_SHIFT(ptr, dataRowLen(pTable->tagVal) + ((STagRow *)pTable->tagVal)->dataLen);
+    ptr = tdDecodeKVRow(ptr, &pTable->tagVal);
   } else {
     pTable->schema = tdDecodeSchema(&ptr);
   }
@@ -114,12 +112,9 @@ void tsdbFreeEncode(void *cont) {
 static char* getTagIndexKey(const void* pData) {
   STableIndexElem* elem = (STableIndexElem*) pData;
   
-  SDataRow row = elem->pTable->tagVal;
   STSchema* pSchema = tsdbGetTableTagSchema(elem->pMeta, elem->pTable);
   STColumn* pCol = &pSchema->columns[DEFAULT_TAG_INDEX_COLUMN];
-  int16_t type = 0;
-  void * res = tdQueryTagByID(row, pCol->colId,&type);
-  ASSERT(type == pCol->type);
+  void * res = tdGetKVRowValOfCol(elem->pTable->tagVal, pCol->colId);
   return res;
 }
 
@@ -271,9 +266,7 @@ int32_t tsdbGetTableTagVal(TsdbRepoT* repo, STableId* id, int32_t colId, int16_t
     return -1;  // No matched tags. Maybe the modification of tags has not been done yet.
   }
   
-  SDataRow row = (SDataRow)pTable->tagVal;
-  int16_t tagtype = 0;
-  char* d = tdQueryTagByID(row, pCol->colId, &tagtype);
+  char* d = tdGetKVRowValOfCol(pTable->tagVal, pCol->colId);
   //ASSERT((int8_t)tagtype == pCol->type)
   *val = d;
   *type  = pCol->type;
@@ -352,7 +345,7 @@ static STable *tsdbNewTable(STableCfg *pCfg, bool isSuper) {
 
     if (pCfg->type == TSDB_CHILD_TABLE) {
       pTable->superUid = pCfg->superUid;
-      pTable->tagVal = tdDataRowDup(pCfg->tagValues);
+      pTable->tagVal = tdKVRowDup(pCfg->tagValues);
     } else if (pCfg->type == TSDB_NORMAL_TABLE) {
       pTable->superUid = -1;
       pTable->schema = tdDupSchema(pCfg->schema);
@@ -487,7 +480,7 @@ static int tsdbFreeTable(STable *pTable) {
   if (pTable == NULL) return 0;
 
   if (pTable->type == TSDB_CHILD_TABLE) {
-    tdFreeTagRow(pTable->tagVal);
+    kvRowFree(pTable->tagVal);
   } else {
     tdFreeSchema(pTable->schema);
   }
@@ -636,9 +629,7 @@ static int tsdbRemoveTableFromIndex(STsdbMeta *pMeta, STable *pTable) {
   STSchema* pSchema = tsdbGetTableTagSchema(pMeta, pTable);
   STColumn* pCol = &pSchema->columns[DEFAULT_TAG_INDEX_COLUMN];
   
-  int16_t tagtype = 0;
-  char* key = tdQueryTagByID(pTable->tagVal, pCol->colId, &tagtype);
-  ASSERT(pCol->type == tagtype);
+  char* key = tdGetKVRowValOfCol(pTable->tagVal, pCol->colId);
   SArray* res = tSkipListGet(pSTable->pIndex, key);
   
   size_t size = taosArrayGetSize(res);
diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 2220ebfd88abf6933ae4c88003b26b1c9be9b1b4..88f6bb9efce94b76a245195a5fddb673dd7e8b22 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -1753,9 +1753,8 @@ int32_t tableGroupComparFn(const void *p1, const void *p2, const void *param) {
       STColumn* pCol = schemaColAt(pTableGroupSupp->pTagSchema, colIndex);
       bytes = pCol->bytes;
       type = pCol->type;
-      int16_t tgtype1, tgtype2 = 0;
-      f1 = tdQueryTagByID(pTable1->tagVal, pCol->colId, &tgtype1);
-      f2 = tdQueryTagByID(pTable2->tagVal, pCol->colId, &tgtype2);
+      f1 = tdGetKVRowValOfCol(pTable1->tagVal, pCol->colId);
+      f2 = tdGetKVRowValOfCol(pTable2->tagVal, pCol->colId);
     }
     
     int32_t ret = doCompare(f1, f2, type, bytes);
@@ -1843,12 +1842,7 @@ bool indexedNodeFilterFp(const void* pNode, void* param) {
     val = (char*) elem->pTable->name;
     type = TSDB_DATA_TYPE_BINARY;
   } else {
-//    STSchema* pTSchema = (STSchema*) pInfo->param; // todo table schema is identical to stable schema??
-    int16_t type;
-  //  int32_t offset = pTSchema->columns[pInfo->colIndex].offset;
-  //  val = tdGetRowDataOfCol(elem->pTable->tagVal, pInfo->sch.type, TD_DATA_ROW_HEAD_SIZE + offset);
-    val = tdQueryTagByID(elem->pTable->tagVal, pInfo->sch.colId, &type);
-  //  ASSERT(pInfo->sch.type == type);    
+    val = tdGetKVRowValOfCol(elem->pTable->tagVal, pInfo->sch.colId);
   }
   //todo :the val is possible to be null, so check it out carefully
   int32_t ret = 0;
diff --git a/src/vnode/src/vnodeWrite.c b/src/vnode/src/vnodeWrite.c
index 09cb2d3fac89f634277ed9133c7723cf1f29cccc..1fa8abe379f06bfb822a9ad68ed34e898b573b53 100644
--- a/src/vnode/src/vnodeWrite.c
+++ b/src/vnode/src/vnodeWrite.c
@@ -139,16 +139,16 @@ static int32_t vnodeProcessCreateTableMsg(SVnodeObj *pVnode, void *pCont, SRspRe
     
     char *pTagData = pTable->data + totalCols * sizeof(SSchema);
     int accumBytes = 0;
-    //dataRow = tdNewDataRowFromSchema(pDestTagSchema);
-    dataRow = tdNewTagRowFromSchema(pDestTagSchema, numOfTags);
 
+    SKVRowBuilder kvRowBuilder;
+    tdInitKVRowBuilder(&kvRowBuilder);
     for (int i = 0; i < numOfTags; i++) {
       STColumn *pTCol = schemaColAt(pDestTagSchema, i);
-//      tdAppendColVal(dataRow, pTagData + accumBytes, pTCol->type, pTCol->bytes, pTCol->offset);
-      tdAppendTagColVal(dataRow, pTagData + accumBytes, pTCol->type, pTCol->bytes, pTCol->colId);
+      tdAddColToKVRow(&kvRowBuilder, pTCol->colId, pTCol->type, pTagData + accumBytes);
       accumBytes += htons(pSchema[i + numOfColumns].bytes);
     }
-    tsdbTableSetTagValue(&tCfg, dataRow, false);
+    tsdbTableSetTagValue(&tCfg, tdGetKVRowFromBuilder(&kvRowBuilder), false);
+    tdDestroyKVRowBuilder(&kvRowBuilder);
   }
 
   // only normal has sql string