diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index b5740b0118c1286a1d38a73575d3227c998f3e10..ea8bbb1231a229d6c374a799bfcaa61cf1865da5 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -228,7 +228,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_TOO_MANY_COLUMNS          TAOS_DEF_ERROR_CODE(0, 0x03A9)
 #define TSDB_CODE_MND_COLUMN_ALREAY_EXIST       TAOS_DEF_ERROR_CODE(0, 0x03AA)
 #define TSDB_CODE_MND_COLUMN_NOT_EXIST          TAOS_DEF_ERROR_CODE(0, 0x03AB)
-#define TSDB_CODE_MND_EXCEED_MAX_ROW_BYTES      TAOS_DEF_ERROR_CODE(0, 0x03AC)
+#define TSDB_CODE_MND_INVALID_ROW_BYTES         TAOS_DEF_ERROR_CODE(0, 0x03AC)
 #define TSDB_CODE_MND_NAME_CONFLICT_WITH_TOPIC  TAOS_DEF_ERROR_CODE(0, 0x03AD)
 
 // mnode-func
diff --git a/source/dnode/mnode/impl/src/mndStb.c b/source/dnode/mnode/impl/src/mndStb.c
index 7e025602caa01da422f53bd212088fc13b4f4bdd..ba0b5aac9de68e4113052b35e5e7878ddcb9f266 100644
--- a/source/dnode/mnode/impl/src/mndStb.c
+++ b/source/dnode/mnode/impl/src/mndStb.c
@@ -608,7 +608,288 @@ static int32_t mndCheckAlterStbReq(SMAlterStbReq *pAlter) {
   return 0;
 }
 
-static int32_t mndUpdateStb(SMnode *pMnode, SMnodeMsg *pReq, SStbObj *pOld, SStbObj *pNew) { return 0; }
+static int32_t mndFindSuperTableTagIndex(const SStbObj *pStb, const char *tagName) {
+  for (int32_t tag = 0; tag < pStb->numOfTags; tag++) {
+    if (strcasecmp(pStb->pTags[tag].name, tagName) == 0) {
+      return tag;
+    }
+  }
+
+  return -1;
+}
+
+static int32_t mndFindSuperTableColumnIndex(const SStbObj *pStb, const char *colName) {
+  for (int32_t col = 0; col < pStb->numOfColumns; col++) {
+    if (strcasecmp(pStb->pColumns[col].name, colName) == 0) {
+      return col;
+    }
+  }
+
+  return -1;
+}
+
+static int32_t mndAllocStbSchemas(const SStbObj *pOld, SStbObj *pNew) {
+  pNew->pTags = calloc(pNew->numOfTags, sizeof(SSchema));
+  pNew->pColumns = calloc(pNew->numOfColumns, sizeof(SSchema));
+  if (pNew->pTags == NULL || pNew->pColumns == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return -1;
+  }
+
+  memcpy(pNew->pColumns, pOld->pColumns, sizeof(SSchema) * pOld->numOfColumns);
+  memcpy(pNew->pTags, pOld->pTags, sizeof(SSchema) * pOld->numOfTags);
+  return 0;
+}
+
+static int32_t mndAddSuperTableTag(const SStbObj *pOld, SStbObj *pNew, const SSchema *pSchemas, int32_t ntags) {
+  if (pOld->numOfTags + ntags > TSDB_MAX_TAGS) {
+    terrno = TSDB_CODE_MND_TOO_MANY_TAGS;
+    return -1;
+  }
+
+  if (pOld->numOfColumns + ntags + pOld->numOfTags > TSDB_MAX_COLUMNS) {
+    terrno = TSDB_CODE_MND_TOO_MANY_COLUMNS;
+    return -1;
+  }
+
+  for (int32_t i = 0; i < ntags; i++) {
+    if (mndFindSuperTableColumnIndex(pOld, pSchemas[i].name) > 0) {
+      terrno = TSDB_CODE_MND_TAG_ALREAY_EXIST;
+      return -1;
+    }
+
+    if (mndFindSuperTableTagIndex(pOld, pSchemas[i].name) > 0) {
+      terrno = TSDB_CODE_MND_COLUMN_ALREAY_EXIST;
+      return -1;
+    }
+  }
+
+  pNew->numOfTags = pNew->numOfTags + ntags;
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  memcpy(pNew->pTags + pOld->numOfTags, pSchemas, sizeof(SSchema) * ntags);
+
+  for (int32_t i = pOld->numOfTags; i < pNew->numOfTags; i++) {
+    SSchema *pSchema = &pNew->pTags[i];
+    pSchema->colId = pNew->nextColId;
+    pNew->nextColId++;
+  }
+
+  pNew->version++;
+  mDebug("stb:%s, start to add tag %s", pNew->name, pSchemas[0].name);
+  return 0;
+}
+
+static int32_t mndDropSuperTableTag(const SStbObj *pOld, SStbObj *pNew, const char *tagName) {
+  int32_t tag = mndFindSuperTableTagIndex(pOld, tagName);
+  if (tag < 0) {
+    terrno = TSDB_CODE_MND_TAG_NOT_EXIST;
+    return -1;
+  }
+
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  memmove(pNew->pTags + tag, pNew->pTags + tag + 1, sizeof(SSchema) * (pNew->numOfTags - tag - 1));
+
+  pNew->version++;
+  mDebug("stb:%s, start to drop tag %s", pNew->name, tagName);
+  return 0;
+}
+
+static int32_t mndModifySuperTableTagName(const SStbObj *pOld, SStbObj *pNew, const char *oldTagName,
+                                          const char *newTagName) {
+  int32_t tag = mndFindSuperTableTagIndex(pOld, oldTagName);
+  if (tag < 0) {
+    terrno = TSDB_CODE_MND_TAG_NOT_EXIST;
+    return -1;
+  }
+
+  if (mndFindSuperTableTagIndex(pOld, newTagName) >= 0) {
+    terrno = TSDB_CODE_MND_TAG_ALREAY_EXIST;
+    return -1;
+  }
+
+  int32_t len = (int32_t)strlen(newTagName);
+  if (len >= TSDB_COL_NAME_LEN) {
+    terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
+    return -1;
+  }
+
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  SSchema *pSchema = (SSchema *)(pNew->pTags + tag);
+  memcpy(pSchema->name, newTagName, TSDB_COL_NAME_LEN);
+
+  pNew->version++;
+  mDebug("stb:%s, start to modify tag %s to %s", pNew->name, oldTagName, newTagName);
+  return 0;
+}
+
+static int32_t mndChangeSuperTableTag(const SStbObj *pOld, SStbObj *pNew, const SSchema *pSchema) {
+  int32_t tag = mndFindSuperTableTagIndex(pOld, pSchema->name);
+  if (tag < 0) {
+    terrno = TSDB_CODE_MND_TAG_NOT_EXIST;
+    return -1;
+  }
+
+  if (!(pSchema->type == TSDB_DATA_TYPE_BINARY || pSchema->type == TSDB_DATA_TYPE_NCHAR)) {
+    terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
+    return -1;
+  }
+
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  SSchema *pTag = pNew->pTags + tag;
+  if (pSchema->bytes <= pTag->bytes) {
+    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
+    return -1;
+  }
+
+  pTag->bytes = pSchema->bytes;
+  pNew->version++;
+
+  mDebug("stb:%s, start to modify tag len %s to %d", pNew->name, pSchema->name, pSchema->bytes);
+  return 0;
+}
+
+static int32_t mndAddSuperTableColumn(const SStbObj *pOld, SStbObj *pNew, const SSchema *pSchemas, int32_t ncols) {
+  if (pOld->numOfColumns + ncols + pOld->numOfTags > TSDB_MAX_COLUMNS) {
+    terrno = TSDB_CODE_MND_TOO_MANY_COLUMNS;
+    return -1;
+  }
+
+  for (int32_t i = 0; i < ncols; i++) {
+    if (mndFindSuperTableColumnIndex(pOld, pSchemas[i].name) > 0) {
+      terrno = TSDB_CODE_MND_TAG_ALREAY_EXIST;
+      return -1;
+    }
+
+    if (mndFindSuperTableTagIndex(pOld, pSchemas[i].name) > 0) {
+      terrno = TSDB_CODE_MND_COLUMN_ALREAY_EXIST;
+      return -1;
+    }
+  }
+
+  pNew->numOfColumns = pNew->numOfColumns + ncols;
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  memcpy(pNew->pColumns + pOld->numOfColumns, pSchemas, sizeof(SSchema) * ncols);
+
+  for (int32_t i = pOld->numOfColumns; i < pNew->numOfColumns; i++) {
+    SSchema *pSchema = &pNew->pColumns[i];
+    pSchema->colId = pNew->nextColId;
+    pNew->nextColId++;
+  }
+
+  pNew->version++;
+  mDebug("stb:%s, start to add column %s", pNew->name, pSchemas[0].name);
+  return 0;
+}
+
+static int32_t mndDropSuperTableColumn(const SStbObj *pOld, SStbObj *pNew, const char *colName) {
+  int32_t col = mndFindSuperTableColumnIndex(pOld, colName);
+  if (col <= 0) {
+    terrno = TSDB_CODE_MND_COLUMN_NOT_EXIST;
+    return -1;
+  }
+
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  memmove(pNew->pColumns + col, pNew->pColumns + col + 1, sizeof(SSchema) * (pNew->numOfColumns - col - 1));
+
+  pNew->version++;
+  mDebug("stb:%s, start to drop col %s", pNew->name, colName);
+  return 0;
+}
+
+static int32_t mndChangeSuperTableColumn(const SStbObj *pOld, SStbObj *pNew, const SSchema *pSchema) {
+  int32_t col = mndFindSuperTableColumnIndex(pOld, pSchema->name);
+  if (col < 0) {
+    terrno = TSDB_CODE_MND_COLUMN_NOT_EXIST;
+    return -1;
+  }
+
+  if (!(pSchema->type == TSDB_DATA_TYPE_BINARY || pSchema->type == TSDB_DATA_TYPE_NCHAR)) {
+    terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
+    return -1;
+  }
+
+  uint32_t nLen = 0;
+  for (int32_t i = 0; i < pOld->numOfColumns; ++i) {
+    nLen += (pOld->pColumns[i].colId == col) ? pSchema->bytes : pOld->pColumns[i].bytes;
+  }
+
+  if (nLen > TSDB_MAX_BYTES_PER_ROW) {
+    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
+    return -1;
+  }
+
+  if (mndAllocStbSchemas(pOld, pNew) != 0) {
+    return -1;
+  }
+
+  SSchema *pCol = pNew->pColumns + col;
+  if (pSchema->bytes <= pCol->bytes) {
+    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
+    return -1;
+  }
+
+  pCol->bytes = pSchema->bytes;
+  pNew->version++;
+
+  mDebug("stb:%s, start to modify col len %s to %d", pNew->name, pSchema->name, pSchema->bytes);
+  return 0;
+}
+
+static int32_t mndUpdateStb(const SMAlterStbReq *pAlter, const SStbObj *pOld, SStbObj *pNew) {
+  int32_t code = 0;
+
+  switch (pAlter->alterType) {
+    case TSDB_ALTER_TABLE_ADD_TAG_COLUMN:
+      code = mndAddSuperTableTag(pOld, pNew, pAlter->pSchema, 1);
+      break;
+    case TSDB_ALTER_TABLE_DROP_TAG_COLUMN:
+      code = mndDropSuperTableTag(pOld, pNew, pAlter->pSchema[0].name);
+      break;
+    case TSDB_ALTER_TABLE_CHANGE_TAG_COLUMN:
+      code = mndModifySuperTableTagName(pOld, pNew, pAlter->pSchema[0].name, pAlter->pSchema[1].name);
+      break;
+    case TSDB_ALTER_TABLE_MODIFY_TAG_COLUMN:
+      code = mndChangeSuperTableTag(pOld, pNew, &pAlter->pSchema[0]);
+      break;
+    case TSDB_ALTER_TABLE_ADD_COLUMN:
+      code = mndAddSuperTableColumn(pOld, pNew, pAlter->pSchema, 1);
+      break;
+    case TSDB_ALTER_TABLE_DROP_COLUMN:
+      code = mndDropSuperTableColumn(pOld, pNew, pAlter->pSchema[0].name);
+      break;
+    case TSDB_ALTER_TABLE_CHANGE_COLUMN:
+      code = mndChangeSuperTableColumn(pOld, pNew, &pAlter->pSchema[0]);
+      break;
+    default:
+      terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
+      break;
+  }
+
+  if (code != 0) {
+    tfree(pNew->pTags);
+    tfree(pNew->pColumns);
+  }
+
+  return code;
+}
 
 static int32_t mndProcessMAlterStbReq(SMnodeMsg *pReq) {
   SMnode        *pMnode = pReq->pMnode;
@@ -629,9 +910,13 @@ static int32_t mndProcessMAlterStbReq(SMnodeMsg *pReq) {
   }
 
   SStbObj stbObj = {0};
+  taosRLockLatch(&pStb->lock);
   memcpy(&stbObj, pStb, sizeof(SStbObj));
+  stbObj.pColumns = NULL;
+  stbObj.pTags = NULL;
+  taosRUnLockLatch(&pStb->lock);
 
-  int32_t code = mndUpdateStb(pMnode, pReq, pStb, &stbObj);
+  int32_t code = mndUpdateStb(pAlter, pStb, &stbObj);
   mndReleaseStb(pMnode, pStb);
 
   if (code != 0) {
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index ee5bea0ab74adccf3a04762bdf7e9ce4077aae84..ca0401113c2f8c84bd4dce3ac93e3fa53e171c89 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -236,9 +236,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_TAGS,            "Too many tags")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TAG_ALREAY_EXIST,         "Tag already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TAG_NOT_EXIST,            "Tag does not exist")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_COLUMNS,         "Too many columns")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_COLUMN_ALREAY_EXIST,       "Column already exists")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_COLUMN_NOT_EXIST,          "Column does not exist")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_EXCEED_MAX_ROW_BYTES,     "Exceed max row bytes")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_COLUMN_ALREAY_EXIST,      "Column already exists")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_COLUMN_NOT_EXIST,         "Column does not exist")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_ROW_BYTES,        "Invalid row bytes")
 
 // mnode-func
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_FUNC_ALREADY_EXIST,       "Func already exists")