diff --git a/include/dnode/mnode/sdb/sdb.h b/include/dnode/mnode/sdb/sdb.h
index a42736e4fb337b244d80486a7e8e0e3fa4a79652..17ce5c952b92ab75a69dfb60c39db7e6707ad90a 100644
--- a/include/dnode/mnode/sdb/sdb.h
+++ b/include/dnode/mnode/sdb/sdb.h
@@ -125,7 +125,8 @@ typedef enum { SDB_KEY_BINARY = 1, SDB_KEY_INT32 = 2, SDB_KEY_INT64 = 3 } EKeyTy
 typedef enum {
   SDB_STATUS_CREATING = 1,
   SDB_STATUS_READY = 2,
-  SDB_STATUS_DROPPED = 3
+  SDB_STATUS_DROPPING = 3,
+  SDB_STATUS_DROPPED = 4
 } ESdbStatus;
 
 typedef enum {
diff --git a/source/dnode/mgmt/impl/test/CMakeLists.txt b/source/dnode/mgmt/impl/test/CMakeLists.txt
index e7aa103996a1aba0e425f17cba9d1f2e2bfaac8d..b3b6818a5c4709b72360fcfe68b2593643228a21 100644
--- a/source/dnode/mgmt/impl/test/CMakeLists.txt
+++ b/source/dnode/mgmt/impl/test/CMakeLists.txt
@@ -1,4 +1,5 @@
-add_subdirectory(acct)
-add_subdirectory(cluster)
-add_subdirectory(profile)
-add_subdirectory(show)
+# add_subdirectory(acct)
+# add_subdirectory(cluster)
+# add_subdirectory(profile)
+# add_subdirectory(show)
+add_subdirectory(user)
diff --git a/source/dnode/mgmt/impl/test/user/user.cpp b/source/dnode/mgmt/impl/test/user/user.cpp
index befe005d559a4ccbed52d61848d42186f65a9c7b..081229f825f65942bb675f419fd0e0662e5fe992 100644
--- a/source/dnode/mgmt/impl/test/user/user.cpp
+++ b/source/dnode/mgmt/impl/test/user/user.cpp
@@ -222,7 +222,6 @@ TEST_F(DndTestUser, CreateUser_01) {
   rpcMsg.msgType = TSDB_MSG_TYPE_CREATE_USER;
 
   sendMsg(pClient, &rpcMsg);
-  // taosMsleep(10000000);
   SRpcMsg* pMsg = pClient->pRsp;
   ASSERT_NE(pMsg, nullptr);
   ASSERT_EQ(pMsg->code, 0);
@@ -277,34 +276,132 @@ TEST_F(DndTestUser, CreateUser_01) {
   }
 }
 
-// TEST_F(DndTestUser, AlterUser) {
-//   ASSERT_NE(pClient, nullptr);
+TEST_F(DndTestUser, AlterUser_01) {
+  ASSERT_NE(pClient, nullptr);
+
+  //--- drop user ---
+  SAlterUserMsg* pReq = (SAlterUserMsg*)rpcMallocCont(sizeof(SAlterUserMsg));
+  strcpy(pReq->user, "u1");
+  strcpy(pReq->pass, "p2");
+
+  SRpcMsg rpcMsg = {0};
+  rpcMsg.pCont = pReq;
+  rpcMsg.contLen = sizeof(SDropUserMsg);
+  rpcMsg.msgType = TSDB_MSG_TYPE_ALTER_USER;
+
+  sendMsg(pClient, &rpcMsg);
+  SRpcMsg* pMsg = pClient->pRsp;
+  ASSERT_NE(pMsg, nullptr);
+  ASSERT_EQ(pMsg->code, 0);
+
+  //--- meta ---
+  SShowMsg* pShow = (SShowMsg*)rpcMallocCont(sizeof(SShowMsg));
+  pShow->type = TSDB_MGMT_TABLE_USER;
+  SRpcMsg showRpcMsg = {0};
+  showRpcMsg.pCont = pShow;
+  showRpcMsg.contLen = sizeof(SShowMsg);
+  showRpcMsg.msgType = TSDB_MSG_TYPE_SHOW;
+
+  sendMsg(pClient, &showRpcMsg);
+  SShowRsp*      pShowRsp = (SShowRsp*)pClient->pRsp->pCont;
+  STableMetaMsg* pMeta = &pShowRsp->tableMeta;
+  pMeta->numOfColumns = htons(pMeta->numOfColumns);
+  EXPECT_EQ(pMeta->numOfColumns, 4);
+
+  //--- retrieve ---
+  SRetrieveTableMsg* pRetrieve = (SRetrieveTableMsg*)rpcMallocCont(sizeof(SRetrieveTableMsg));
+  pRetrieve->showId = pShowRsp->showId;
+  SRpcMsg retrieveRpcMsg = {0};
+  retrieveRpcMsg.pCont = pRetrieve;
+  retrieveRpcMsg.contLen = sizeof(SRetrieveTableMsg);
+  retrieveRpcMsg.msgType = TSDB_MSG_TYPE_SHOW_RETRIEVE;
+
+  sendMsg(pClient, &retrieveRpcMsg);
+  SRetrieveTableRsp* pRetrieveRsp = (SRetrieveTableRsp*)pClient->pRsp->pCont;
+  pRetrieveRsp->numOfRows = htonl(pRetrieveRsp->numOfRows);
+  EXPECT_EQ(pRetrieveRsp->numOfRows, 3);
+
+  char*   pData = pRetrieveRsp->data;
+  int32_t pos = 0;
+  char*   strVal = NULL;
+
+  //--- name ---
+  {
+    pos += sizeof(VarDataLenT);
+    strVal = (char*)(pData + pos);
+    pos += TSDB_USER_LEN;
+    EXPECT_STREQ(strVal, "u1");
+
+    pos += sizeof(VarDataLenT);
+    strVal = (char*)(pData + pos);
+    pos += TSDB_USER_LEN;
+    EXPECT_STREQ(strVal, "root");
+
+    pos += sizeof(VarDataLenT);
+    strVal = (char*)(pData + pos);
+    pos += TSDB_USER_LEN;
+    EXPECT_STREQ(strVal, "_root");
+  }
+}
 
-//   SAlterUserMsg* pReq = (SAlterUserMsg*)rpcMallocCont(sizeof(SAlterUserMsg));
+TEST_F(DndTestUser, DropUser_01) {
+  ASSERT_NE(pClient, nullptr);
 
-//   SRpcMsg rpcMsg = {0};
-//   rpcMsg.pCont = pReq;
-//   rpcMsg.contLen = sizeof(SAlterUserMsg);
-//   rpcMsg.msgType = TSDB_MSG_TYPE_ALTER_ACCT;
+  //--- drop user ---
+  SDropUserMsg* pReq = (SDropUserMsg*)rpcMallocCont(sizeof(SDropUserMsg));
+  strcpy(pReq->user, "u1");
 
-//   sendMsg(pClient, &rpcMsg);
-//   SRpcMsg* pMsg = pClient->pRsp;
-//   ASSERT_NE(pMsg, nullptr);
-//   ASSERT_EQ(pMsg->code, TSDB_CODE_MND_MSG_NOT_PROCESSED);
-// }
+  SRpcMsg rpcMsg = {0};
+  rpcMsg.pCont = pReq;
+  rpcMsg.contLen = sizeof(SDropUserMsg);
+  rpcMsg.msgType = TSDB_MSG_TYPE_DROP_USER;
 
-// TEST_F(DndTestUser, DropUser) {
-//   ASSERT_NE(pClient, nullptr);
+  sendMsg(pClient, &rpcMsg);
+  SRpcMsg* pMsg = pClient->pRsp;
+  ASSERT_NE(pMsg, nullptr);
+  ASSERT_EQ(pMsg->code, 0);
 
-//   SDropUserMsg* pReq = (SDropUserMsg*)rpcMallocCont(sizeof(SDropUserMsg));
+  //--- meta ---
+  SShowMsg* pShow = (SShowMsg*)rpcMallocCont(sizeof(SShowMsg));
+  pShow->type = TSDB_MGMT_TABLE_USER;
+  SRpcMsg showRpcMsg = {0};
+  showRpcMsg.pCont = pShow;
+  showRpcMsg.contLen = sizeof(SShowMsg);
+  showRpcMsg.msgType = TSDB_MSG_TYPE_SHOW;
 
-//   SRpcMsg rpcMsg = {0};
-//   rpcMsg.pCont = pReq;
-//   rpcMsg.contLen = sizeof(SDropUserMsg);
-//   rpcMsg.msgType = TSDB_MSG_TYPE_DROP_ACCT;
+  sendMsg(pClient, &showRpcMsg);
+  SShowRsp*      pShowRsp = (SShowRsp*)pClient->pRsp->pCont;
+  STableMetaMsg* pMeta = &pShowRsp->tableMeta;
+  pMeta->numOfColumns = htons(pMeta->numOfColumns);
+  EXPECT_EQ(pMeta->numOfColumns, 4);
 
-//   sendMsg(pClient, &rpcMsg);
-//   SRpcMsg* pMsg = pClient->pRsp;
-//   ASSERT_NE(pMsg, nullptr);
-//   ASSERT_EQ(pMsg->code, TSDB_CODE_MND_MSG_NOT_PROCESSED);
-// }
+  //--- retrieve ---
+  SRetrieveTableMsg* pRetrieve = (SRetrieveTableMsg*)rpcMallocCont(sizeof(SRetrieveTableMsg));
+  pRetrieve->showId = pShowRsp->showId;
+  SRpcMsg retrieveRpcMsg = {0};
+  retrieveRpcMsg.pCont = pRetrieve;
+  retrieveRpcMsg.contLen = sizeof(SRetrieveTableMsg);
+  retrieveRpcMsg.msgType = TSDB_MSG_TYPE_SHOW_RETRIEVE;
+
+  sendMsg(pClient, &retrieveRpcMsg);
+  SRetrieveTableRsp* pRetrieveRsp = (SRetrieveTableRsp*)pClient->pRsp->pCont;
+  pRetrieveRsp->numOfRows = htonl(pRetrieveRsp->numOfRows);
+  EXPECT_EQ(pRetrieveRsp->numOfRows, 2);
+
+  char*   pData = pRetrieveRsp->data;
+  int32_t pos = 0;
+  char*   strVal = NULL;
+
+  //--- name ---
+  {
+    pos += sizeof(VarDataLenT);
+    strVal = (char*)(pData + pos);
+    pos += TSDB_USER_LEN;
+    EXPECT_STREQ(strVal, "root");
+
+    pos += sizeof(VarDataLenT);
+    strVal = (char*)(pData + pos);
+    pos += TSDB_USER_LEN;
+    EXPECT_STREQ(strVal, "_root");
+  }
+}
\ No newline at end of file
diff --git a/source/dnode/mnode/impl/src/mndAcct.c b/source/dnode/mnode/impl/src/mndAcct.c
index 3d668a76f8373fa019f4af41d2e54bb5d26369fb..a365ad7326ba2367f57364b81d1031dc6e9a80cb 100644
--- a/source/dnode/mnode/impl/src/mndAcct.c
+++ b/source/dnode/mnode/impl/src/mndAcct.c
@@ -24,7 +24,7 @@ static SSdbRaw *mnodeAcctActionEncode(SAcctObj *pAcct);
 static SSdbRow *mnodeAcctActionDecode(SSdbRaw *pRaw);
 static int32_t  mnodeAcctActionInsert(SSdb *pSdb, SAcctObj *pAcct);
 static int32_t  mnodeAcctActionDelete(SSdb *pSdb, SAcctObj *pAcct);
-static int32_t  mnodeAcctActionUpdate(SSdb *pSdb, SAcctObj *pSrcAcct, SAcctObj *pDstAcct);
+static int32_t  mnodeAcctActionUpdate(SSdb *pSdb, SAcctObj *pOldAcct, SAcctObj *pNewAcct);
 static int32_t  mndProcessCreateAcctMsg(SMnodeMsg *pMnodeMsg);
 static int32_t  mndProcessAlterAcctMsg(SMnodeMsg *pMnodeMsg);
 static int32_t  mndProcessDropAcctMsg(SMnodeMsg *pMnodeMsg);
@@ -131,15 +131,15 @@ static int32_t mnodeAcctActionDelete(SSdb *pSdb, SAcctObj *pAcct) {
   return 0;
 }
 
-static int32_t mnodeAcctActionUpdate(SSdb *pSdb, SAcctObj *pSrcAcct, SAcctObj *pDstAcct) {
-  mTrace("acct:%s, perform update action", pDstAcct->acct);
+static int32_t mnodeAcctActionUpdate(SSdb *pSdb, SAcctObj *pOldAcct, SAcctObj *pNewAcct) {
+  mTrace("acct:%s, perform update action", pOldAcct->acct);
 
-  memcpy(pDstAcct->acct, pSrcAcct->acct, TSDB_USER_LEN);
-  pDstAcct->createdTime = pSrcAcct->createdTime;
-  pDstAcct->updateTime = pSrcAcct->updateTime;
-  pDstAcct->acctId = pSrcAcct->acctId;
-  pDstAcct->status = pSrcAcct->status;
-  pDstAcct->cfg = pSrcAcct->cfg;
+  memcpy(pOldAcct->acct, pNewAcct->acct, TSDB_USER_LEN);
+  pOldAcct->createdTime = pNewAcct->createdTime;
+  pOldAcct->updateTime = pNewAcct->updateTime;
+  pOldAcct->acctId = pNewAcct->acctId;
+  pOldAcct->status = pNewAcct->status;
+  pOldAcct->cfg = pNewAcct->cfg;
   return 0;
 }
 
diff --git a/source/dnode/mnode/impl/src/mndCluster.c b/source/dnode/mnode/impl/src/mndCluster.c
index f260c83538c3ff04be3bdb81fcda878fa0c381be..97baeb0a591a16db52f1453e7188d7848f40c65c 100644
--- a/source/dnode/mnode/impl/src/mndCluster.c
+++ b/source/dnode/mnode/impl/src/mndCluster.c
@@ -24,7 +24,7 @@ static SSdbRaw *mndClusterActionEncode(SClusterObj *pCluster);
 static SSdbRow *mndClusterActionDecode(SSdbRaw *pRaw);
 static int32_t  mndClusterActionInsert(SSdb *pSdb, SClusterObj *pCluster);
 static int32_t  mndClusterActionDelete(SSdb *pSdb, SClusterObj *pCluster);
-static int32_t  mndClusterActionUpdate(SSdb *pSdb, SClusterObj *pSrcCluster, SClusterObj *pDstCluster);
+static int32_t  mndClusterActionUpdate(SSdb *pSdb, SClusterObj *pOldCluster, SClusterObj *pNewCluster);
 static int32_t  mndCreateDefaultCluster(SMnode *pMnode);
 static int32_t  mndGetClusterMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaMsg *pMeta);
 static int32_t  mndRetrieveClusters(SMnodeMsg *pMsg, SShowObj *pShow, char *data, int32_t rows);
@@ -107,8 +107,8 @@ static int32_t mndClusterActionDelete(SSdb *pSdb, SClusterObj *pCluster) {
   return 0;
 }
 
-static int32_t mndClusterActionUpdate(SSdb *pSdb, SClusterObj *pSrcCluster, SClusterObj *pDstCluster) {
-  mTrace("cluster:%d, perform update action", pDstCluster->id);
+static int32_t mndClusterActionUpdate(SSdb *pSdb, SClusterObj *pOldCluster, SClusterObj *pNewCluster) {
+  mTrace("cluster:%d, perform update action", pOldCluster->id);
   return 0;
 }
 
diff --git a/source/dnode/mnode/impl/src/mndDnode.c b/source/dnode/mnode/impl/src/mndDnode.c
index 356b3073bf5a1b03b03e6c44dfbf14cbecddb12c..d187294b87eeefc8e8330b918b6b08332a3ea1b9 100644
--- a/source/dnode/mnode/impl/src/mndDnode.c
+++ b/source/dnode/mnode/impl/src/mndDnode.c
@@ -101,13 +101,13 @@ static int32_t mndDnodeActionDelete(SSdb *pSdb, SDnodeObj *pDnode) {
   return 0;
 }
 
-static int32_t mndDnodeActionUpdate(SSdb *pSdb, SDnodeObj *pSrcDnode, SDnodeObj *pDstDnode) {
-  mTrace("dnode:%d, perform update action", pDstDnode->id);
-  pDstDnode->id = pSrcDnode->id;
-  pDstDnode->createdTime = pSrcDnode->createdTime;
-  pDstDnode->updateTime = pSrcDnode->updateTime;
-  pDstDnode->port = pSrcDnode->port;
-  memcpy(pDstDnode->fqdn, pSrcDnode->fqdn, TSDB_FQDN_LEN); 
+static int32_t mndDnodeActionUpdate(SSdb *pSdb, SDnodeObj *pOldDnode, SDnodeObj *pNewDnode) {
+  mTrace("dnode:%d, perform update action", pOldDnode->id);
+  pOldDnode->id = pNewDnode->id;
+  pOldDnode->createdTime = pNewDnode->createdTime;
+  pOldDnode->updateTime = pNewDnode->updateTime;
+  pOldDnode->port = pNewDnode->port;
+  memcpy(pOldDnode->fqdn, pNewDnode->fqdn, TSDB_FQDN_LEN); 
   return 0;
 }
 
diff --git a/source/dnode/mnode/impl/src/mndMnode.c b/source/dnode/mnode/impl/src/mndMnode.c
index 6fa55bb9f1caff3d2f4546b5e893710a518933b9..2490f1fcaeb4a47c5ce58ecbcdb73eb0d506ec13 100644
--- a/source/dnode/mnode/impl/src/mndMnode.c
+++ b/source/dnode/mnode/impl/src/mndMnode.c
@@ -81,11 +81,11 @@ static int32_t mndMnodeActionDelete(SSdb *pSdb, SMnodeObj *pMnodeObj) {
   return 0;
 }
 
-static int32_t mndMnodeActionUpdate(SSdb *pSdb, SMnodeObj *pSrcMnode, SMnodeObj *pDstMnode) {
-  mTrace("mnode:%d, perform update action", pDstMnode->id);
-  pDstMnode->id = pSrcMnode->id;
-  pDstMnode->createdTime = pSrcMnode->createdTime;
-  pDstMnode->updateTime = pSrcMnode->updateTime;
+static int32_t mndMnodeActionUpdate(SSdb *pSdb, SMnodeObj *pOldMnode, SMnodeObj *pNewMnode) {
+  mTrace("mnode:%d, perform update action", pOldMnode->id);
+  pOldMnode->id = pNewMnode->id;
+  pOldMnode->createdTime = pNewMnode->createdTime;
+  pOldMnode->updateTime = pNewMnode->updateTime;
   return 0;
 }
 
diff --git a/source/dnode/mnode/impl/src/mndTrans.c b/source/dnode/mnode/impl/src/mndTrans.c
index 8d1521c79a8885ce0f1715bf79d280f69ddb6eaf..0a15f03149207c677c25e13b2a2147aca078a663 100644
--- a/source/dnode/mnode/impl/src/mndTrans.c
+++ b/source/dnode/mnode/impl/src/mndTrans.c
@@ -23,7 +23,7 @@
 static SSdbRaw *mndTransActionEncode(STrans *pTrans);
 static SSdbRow *mndTransActionDecode(SSdbRaw *pRaw);
 static int32_t  mndTransActionInsert(SSdb *pSdb, STrans *pTrans);
-static int32_t  mndTransActionUpdate(SSdb *pSdb, STrans *pTrans, STrans *pDstTrans);
+static int32_t  mndTransActionUpdate(SSdb *pSdb, STrans *OldTrans, STrans *pOldTrans);
 static int32_t  mndTransActionDelete(SSdb *pSdb, STrans *pTrans);
 
 int32_t mndInitTrans(SMnode *pMnode) {
@@ -244,22 +244,22 @@ static int32_t mndTransActionDelete(SSdb *pSdb, STrans *pTrans) {
   return 0;
 }
 
-static int32_t mndTransActionUpdate(SSdb *pSdb, STrans *pTrans, STrans *pDstTrans) {
-  mTrace("trans:%d, perform update action, stage:%d", pTrans->id, pTrans->stage);
+static int32_t mndTransActionUpdate(SSdb *pSdb, STrans *pOldTrans, STrans *pNewTrans) {
+  mTrace("trans:%d, perform update action, stage:%d", pOldTrans->id, pNewTrans->stage);
 
-  SArray *pArray = pDstTrans->commitLogs;
+  SArray *pArray = pOldTrans->commitLogs;
   int32_t arraySize = taosArrayGetSize(pArray);
 
   for (int32_t i = 0; i < arraySize; ++i) {
     SSdbRaw *pRaw = taosArrayGetP(pArray, i);
     int32_t  code = sdbWrite(pSdb, pRaw);
     if (code != 0) {
-      mError("trans:%d, failed to write raw:%p to sdb since %s", pDstTrans->id, pRaw, terrstr());
+      mError("trans:%d, failed to write raw:%p to sdb since %s", pOldTrans->id, pRaw, terrstr());
       return code;
     }
   }
 
-  pDstTrans->stage = pTrans->stage;
+  pOldTrans->stage = pNewTrans->stage;
   return 0;
 }
 
diff --git a/source/dnode/mnode/impl/src/mndUser.c b/source/dnode/mnode/impl/src/mndUser.c
index 13baee4b54155ced1bd20b10b2be2c18a038e505..b3c23c0372273fbbea69333fa06211fedea92eb8 100644
--- a/source/dnode/mnode/impl/src/mndUser.c
+++ b/source/dnode/mnode/impl/src/mndUser.c
@@ -27,7 +27,7 @@ static SSdbRaw *mndUserActionEncode(SUserObj *pUser);
 static SSdbRow *mndUserActionDecode(SSdbRaw *pRaw);
 static int32_t  mndUserActionInsert(SSdb *pSdb, SUserObj *pUser);
 static int32_t  mndUserActionDelete(SSdb *pSdb, SUserObj *pUser);
-static int32_t  mndUserActionUpdate(SSdb *pSdb, SUserObj *pSrcUser, SUserObj *pDstUser);
+static int32_t  mndUserActionUpdate(SSdb *pSdb, SUserObj *pOldUser, SUserObj *pNewUser);
 static int32_t  mndCreateUser(SMnode *pMnode, char *acct, char *user, char *pass, SMnodeMsg *pMsg);
 static int32_t  mndProcessCreateUserMsg(SMnodeMsg *pMsg);
 static int32_t  mndProcessAlterUserMsg(SMnodeMsg *pMsg);
@@ -168,16 +168,16 @@ static int32_t mndUserActionDelete(SSdb *pSdb, SUserObj *pUser) {
   return 0;
 }
 
-static int32_t mndUserActionUpdate(SSdb *pSdb, SUserObj *pSrcUser, SUserObj *pDstUser) {
-  mTrace("user:%s, perform update action", pSrcUser->user);
-  memcpy(pDstUser->user, pSrcUser->user, TSDB_USER_LEN);
-  memcpy(pDstUser->pass, pSrcUser->pass, TSDB_KEY_LEN);
-  memcpy(pDstUser->acct, pSrcUser->acct, TSDB_USER_LEN);
-  pDstUser->createdTime = pSrcUser->createdTime;
-  pDstUser->updateTime = pSrcUser->updateTime;
-  pDstUser->superAuth = pSrcUser->superAuth;
-  pDstUser->readAuth = pSrcUser->readAuth;
-  pDstUser->writeAuth = pSrcUser->writeAuth;
+static int32_t mndUserActionUpdate(SSdb *pSdb, SUserObj *pOldUser, SUserObj *pNewUser) {
+  mTrace("user:%s, perform update action", pOldUser->user);
+  memcpy(pOldUser->user, pNewUser->user, TSDB_USER_LEN);
+  memcpy(pOldUser->pass, pNewUser->pass, TSDB_KEY_LEN);
+  memcpy(pOldUser->acct, pNewUser->acct, TSDB_USER_LEN);
+  pOldUser->createdTime = pNewUser->createdTime;
+  pOldUser->updateTime = pNewUser->updateTime;
+  pOldUser->superAuth = pNewUser->superAuth;
+  pOldUser->readAuth = pNewUser->readAuth;
+  pOldUser->writeAuth = pNewUser->writeAuth;
   return 0;
 }
 
@@ -243,6 +243,82 @@ static int32_t mndCreateUser(SMnode *pMnode, char *acct, char *user, char *pass,
   return 0;
 }
 
+static int32_t mndUpdateUser(SMnode *pMnode, SUserObj *pOldUser, SUserObj *pNewUser, SMnodeMsg *pMsg) {
+  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, pMsg->rpcMsg.handle);
+  if (pTrans == NULL) {
+    mError("user:%s, failed to update since %s", pOldUser->user, terrstr());
+    return -1;
+  }
+  mDebug("trans:%d, used to update user:%s", pTrans->id, pOldUser->user);
+
+  SSdbRaw *pRedoRaw = mndUserActionEncode(pNewUser);
+  if (pRedoRaw == NULL || mndTransAppendRedolog(pTrans, pRedoRaw) != 0) {
+    mError("trans:%d, failed to append redo log since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+  sdbSetRawStatus(pRedoRaw, SDB_STATUS_READY);
+
+  SSdbRaw *pUndoRaw = mndUserActionEncode(pOldUser);
+  if (pUndoRaw == NULL || mndTransAppendUndolog(pTrans, pUndoRaw) != 0) {
+    mError("trans:%d, failed to append undo log since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+  sdbSetRawStatus(pUndoRaw, SDB_STATUS_READY);
+
+  if (mndTransPrepare(pTrans) != 0) {
+    mError("trans:%d, failed to prepare since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+
+  mndTransDrop(pTrans);
+  return 0;
+}
+
+static int32_t mndDropUser(SMnode *pMnode, SUserObj *pUser, SMnodeMsg *pMsg) {
+  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, pMsg->rpcMsg.handle);
+  if (pTrans == NULL) {
+    mError("user:%s, failed to drop since %s", pUser->user, terrstr());
+    return -1;
+  }
+  mDebug("trans:%d, used to drop user:%s", pTrans->id, pUser->user);
+
+  SSdbRaw *pRedoRaw = mndUserActionEncode(pUser);
+  if (pRedoRaw == NULL || mndTransAppendRedolog(pTrans, pRedoRaw) != 0) {
+    mError("trans:%d, failed to append redo log since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+  sdbSetRawStatus(pRedoRaw, SDB_STATUS_DROPPING);
+
+  SSdbRaw *pUndoRaw = mndUserActionEncode(pUser);
+  if (pUndoRaw == NULL || mndTransAppendUndolog(pTrans, pUndoRaw) != 0) {
+    mError("trans:%d, failed to append undo log since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+  sdbSetRawStatus(pUndoRaw, SDB_STATUS_READY);
+
+  SSdbRaw *pCommitRaw = mndUserActionEncode(pUser);
+  if (pCommitRaw == NULL || mndTransAppendCommitlog(pTrans, pCommitRaw) != 0) {
+    mError("trans:%d, failed to append commit log since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+  sdbSetRawStatus(pCommitRaw, SDB_STATUS_DROPPED);
+
+  if (mndTransPrepare(pTrans) != 0) {
+    mError("trans:%d, failed to prepare since %s", pTrans->id, terrstr());
+    mndTransDrop(pTrans);
+    return -1;
+  }
+
+  mndTransDrop(pTrans);
+  return 0;
+}
+
 static int32_t mndProcessCreateUserMsg(SMnodeMsg *pMsg) {
   SMnode         *pMnode = pMsg->pMnode;
   SCreateUserMsg *pCreate = pMsg->rpcMsg.pCont;
@@ -288,15 +364,88 @@ static int32_t mndProcessCreateUserMsg(SMnodeMsg *pMsg) {
 }
 
 static int32_t mndProcessAlterUserMsg(SMnodeMsg *pMsg) {
-  terrno = TSDB_CODE_MND_MSG_NOT_PROCESSED;
-  mError("failed to process alter user msg since %s", terrstr());
-  return -1;
+  SMnode        *pMnode = pMsg->pMnode;
+  SAlterUserMsg *pAlter = pMsg->rpcMsg.pCont;
+
+  mDebug("user:%s, start to alter", pAlter->user);
+
+  if (pAlter->user[0] == 0) {
+    terrno = TSDB_CODE_MND_INVALID_USER_FORMAT;
+    mError("user:%s, failed to alter since %s", pAlter->user, terrstr());
+    return -1;
+  }
+
+  if (pAlter->pass[0] == 0) {
+    terrno = TSDB_CODE_MND_INVALID_PASS_FORMAT;
+    mError("user:%s, failed to alter since %s", pAlter->user, terrstr());
+    return -1;
+  }
+
+  SUserObj *pUser = sdbAcquire(pMnode->pSdb, SDB_USER, pAlter->user);
+  if (pUser == NULL) {
+    terrno = TSDB_CODE_MND_USER_NOT_EXIST;
+    mError("user:%s, failed to alter since %s", pAlter->user, terrstr());
+    return -1;
+  }
+
+  SUserObj *pOperUser = sdbAcquire(pMnode->pSdb, SDB_USER, pMsg->user);
+  if (pOperUser == NULL) {
+    terrno = TSDB_CODE_MND_NO_USER_FROM_CONN;
+    mError("user:%s, failed to alter since %s", pAlter->user, terrstr());
+    return -1;
+  }
+
+  SUserObj newUser = {0};
+  memcpy(&newUser, pUser, sizeof(SUserObj));
+  memset(pUser->pass, 0, sizeof(pUser->pass));
+  taosEncryptPass((uint8_t *)pAlter->pass, strlen(pAlter->pass), pUser->pass);
+
+  int32_t code = mndUpdateUser(pMnode, pUser, &newUser, pMsg);
+  sdbRelease(pMnode->pSdb, pOperUser);
+
+  if (code != 0) {
+    mError("user:%s, failed to alter since %s", pAlter->user, terrstr());
+    return -1;
+  }
+
+  return TSDB_CODE_MND_ACTION_IN_PROGRESS;
 }
 
 static int32_t mndProcessDropUserMsg(SMnodeMsg *pMsg) {
-  terrno = TSDB_CODE_MND_MSG_NOT_PROCESSED;
-  mError("failed to process drop user msg since %s", terrstr());
-  return -1;
+  SMnode       *pMnode = pMsg->pMnode;
+  SDropUserMsg *pDrop = pMsg->rpcMsg.pCont;
+
+  mDebug("user:%s, start to drop", pDrop->user);
+
+  if (pDrop->user[0] == 0) {
+    terrno = TSDB_CODE_MND_INVALID_USER_FORMAT;
+    mError("user:%s, failed to drop since %s", pDrop->user, terrstr());
+    return -1;
+  }
+
+  SUserObj *pUser = sdbAcquire(pMnode->pSdb, SDB_USER, pDrop->user);
+  if (pUser == NULL) {
+    terrno = TSDB_CODE_MND_USER_NOT_EXIST;
+    mError("user:%s, failed to drop since %s", pDrop->user, terrstr());
+    return -1;
+  }
+
+  SUserObj *pOperUser = sdbAcquire(pMnode->pSdb, SDB_USER, pMsg->user);
+  if (pOperUser == NULL) {
+    terrno = TSDB_CODE_MND_NO_USER_FROM_CONN;
+    mError("user:%s, failed to drop since %s", pDrop->user, terrstr());
+    return -1;
+  }
+
+  int32_t code = mndDropUser(pMnode, pUser, pMsg);
+  sdbRelease(pMnode->pSdb, pOperUser);
+
+  if (code != 0) {
+    mError("user:%s, failed to drop since %s", pDrop->user, terrstr());
+    return -1;
+  }
+
+  return TSDB_CODE_MND_ACTION_IN_PROGRESS;
 }
 
 static int32_t mndGetUserMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaMsg *pMeta) {
diff --git a/source/dnode/mnode/sdb/src/sdbHash.c b/source/dnode/mnode/sdb/src/sdbHash.c
index 53fcc3f5b0bae6877c8d3f492f568d61f1bf8326..a852389d8082e6eb62975d0b5df5c3cb8a904b59 100644
--- a/source/dnode/mnode/sdb/src/sdbHash.c
+++ b/source/dnode/mnode/sdb/src/sdbHash.c
@@ -52,8 +52,8 @@ static int32_t sdbInsertRow(SSdb *pSdb, SHashObj *hash, SSdbRaw *pRaw, SSdbRow *
   SRWLatch *pLock = &pSdb->locks[pRow->type];
   taosWLockLatch(pLock);
 
-  SSdbRow *pDstRow = taosHashGet(hash, pRow->pObj, keySize);
-  if (pDstRow != NULL) {
+  SSdbRow *pOldRow = taosHashGet(hash, pRow->pObj, keySize);
+  if (pOldRow != NULL) {
     taosWUnLockLatch(pLock);
     sdbFreeRow(pRow);
     return TSDB_CODE_SDB_OBJ_ALREADY_THERE;
@@ -85,28 +85,28 @@ static int32_t sdbInsertRow(SSdb *pSdb, SHashObj *hash, SSdbRaw *pRaw, SSdbRow *
   return 0;
 }
 
-static int32_t sdbUpdateRow(SSdb *pSdb, SHashObj *hash, SSdbRaw *pRaw, SSdbRow *pRow, int32_t keySize) {
+static int32_t sdbUpdateRow(SSdb *pSdb, SHashObj *hash, SSdbRaw *pRaw, SSdbRow *pNewRow, int32_t keySize) {
   int32_t code = 0;
 
-  SRWLatch *pLock = &pSdb->locks[pRow->type];
+  SRWLatch *pLock = &pSdb->locks[pNewRow->type];
   taosRLockLatch(pLock);
 
-  SSdbRow **ppDstRow = taosHashGet(hash, pRow->pObj, keySize);
-  if (ppDstRow == NULL || *ppDstRow == NULL) {
+  SSdbRow **ppOldRow = taosHashGet(hash, pNewRow->pObj, keySize);
+  if (ppOldRow == NULL || *ppOldRow == NULL) {
     taosRUnLockLatch(pLock);
-    return sdbInsertRow(pSdb, hash, pRaw, pRow, keySize);
+    return sdbInsertRow(pSdb, hash, pRaw, pNewRow, keySize);
   }
-  SSdbRow *pDstRow = *ppDstRow;
+  SSdbRow *pOldRow = *ppOldRow;
 
-  pDstRow->status = pRaw->status;
+  pOldRow->status = pRaw->status;
   taosRUnLockLatch(pLock);
 
-  SdbUpdateFp updateFp = pSdb->updateFps[pRow->type];
+  SdbUpdateFp updateFp = pSdb->updateFps[pNewRow->type];
   if (updateFp != NULL) {
-    code = (*updateFp)(pSdb, pRow->pObj, pDstRow->pObj);
+    code = (*updateFp)(pSdb, pOldRow->pObj, pNewRow->pObj);
   }
 
-  sdbFreeRow(pRow);
+  sdbFreeRow(pNewRow);
   return code;
 }
 
@@ -116,24 +116,24 @@ static int32_t sdbDeleteRow(SSdb *pSdb, SHashObj *hash, SSdbRaw *pRaw, SSdbRow *
   SRWLatch *pLock = &pSdb->locks[pRow->type];
   taosWLockLatch(pLock);
 
-  SSdbRow **ppDstRow = taosHashGet(hash, pRow->pObj, keySize);
-  if (ppDstRow == NULL || *ppDstRow == NULL) {
+  SSdbRow **ppOldRow = taosHashGet(hash, pRow->pObj, keySize);
+  if (ppOldRow == NULL || *ppOldRow == NULL) {
     taosWUnLockLatch(pLock);
     sdbFreeRow(pRow);
     return TSDB_CODE_SDB_OBJ_NOT_THERE;
   }
-  SSdbRow *pDstRow = *ppDstRow;
+  SSdbRow *pOldRow = *ppOldRow;
 
-  pDstRow->status = pRaw->status;
-  taosHashRemove(hash, pDstRow->pObj, keySize);
+  pOldRow->status = pRaw->status;
+  taosHashRemove(hash, pOldRow->pObj, keySize);
   taosWUnLockLatch(pLock);
 
-  SdbDeleteFp deleteFp = pSdb->deleteFps[pDstRow->type];
+  SdbDeleteFp deleteFp = pSdb->deleteFps[pOldRow->type];
   if (deleteFp != NULL) {
-    code = (*deleteFp)(pSdb, pDstRow->pObj);
+    code = (*deleteFp)(pSdb, pOldRow->pObj);
   }
 
-  sdbRelease(pSdb, pDstRow->pObj);
+  sdbRelease(pSdb, pOldRow->pObj);
   sdbFreeRow(pRow);
   return code;
 }
@@ -158,6 +158,7 @@ int32_t sdbWriteNotFree(SSdb *pSdb, SSdbRaw *pRaw) {
       code = sdbInsertRow(pSdb, hash, pRaw, pRow, keySize);
       break;
     case SDB_STATUS_READY:
+    case SDB_STATUS_DROPPING:
       code = sdbUpdateRow(pSdb, hash, pRaw, pRow, keySize);
       break;
     case SDB_STATUS_DROPPED:
@@ -200,7 +201,7 @@ void *sdbAcquire(SSdb *pSdb, ESdbType type, void *pKey) {
     case SDB_STATUS_CREATING:
       terrno = TSDB_CODE_SDB_OBJ_CREATING;
       break;
-    case SDB_STATUS_DROPPED:
+    case SDB_STATUS_DROPPING:
       terrno = TSDB_CODE_SDB_OBJ_DROPPING;
       break;
     default: