diff --git a/include/client/taos.h b/include/client/taos.h
index dac8e61542..6492827b2b 100644
--- a/include/client/taos.h
+++ b/include/client/taos.h
@@ -125,7 +125,8 @@ typedef enum {
 
 typedef enum {
   TAOS_NOTIFY_PASSVER = 0,
-  TAOS_NOTIFY_WHITELIST_VER = 1
+  TAOS_NOTIFY_WHITELIST_VER = 1,
+  TAOS_NOTIFY_USER_DROPPED = 2,
 } TAOS_NOTIFY_TYPE;
 
 #define RET_MSG_LENGTH 1024
diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index a0af96853e..af44184de6 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -959,7 +959,7 @@ typedef struct {
   int8_t    superAuth;
   int8_t    sysInfo;
   int8_t    enable;
-  int8_t    reserve;
+  int8_t    dropped;
   SHashObj* createdDbs;
   SHashObj* readDbs;
   SHashObj* writeDbs;
diff --git a/source/client/inc/clientInt.h b/source/client/inc/clientInt.h
index 9448634c5b..bde98052af 100644
--- a/source/client/inc/clientInt.h
+++ b/source/client/inc/clientInt.h
@@ -133,11 +133,13 @@ typedef struct {
   int32_t            ver;
   void*              param;
   __taos_notify_fn_t fp;
-} SPassInfo;
+} STscNotifyInfo;
+
+typedef STscNotifyInfo SPassInfo;
 
 typedef struct {
-  int64_t ver;
-  void* param;
+  int64_t            ver;
+  void*              param;
   __taos_notify_fn_t fp;
 } SWhiteListInfo;
 
@@ -159,6 +161,7 @@ typedef struct STscObj {
   SHashObj*     pRequests;
   SPassInfo     passInfo;
   SWhiteListInfo whiteListInfo;
+  STscNotifyInfo userDroppedInfo;
 } STscObj;
 
 typedef struct STscDbg {
diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index e64f0d779c..a4fa1e0c41 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -96,6 +96,19 @@ static int32_t hbUpdateUserAuthInfo(SAppHbMgr *pAppHbMgr, SUserAuthBatchRsp *bat
         }
       }
 
+      if (pRsp->dropped == 1) {
+        if (pTscObj->userDroppedInfo.fp) {
+          SPassInfo *dropInfo = &pTscObj->userDroppedInfo;
+          if (dropInfo->fp) {
+            (*dropInfo->fp)(dropInfo->param, NULL, TAOS_NOTIFY_USER_DROPPED);
+          }
+        }
+        releaseTscObj(pReq->connKey.tscRid);
+        // delete the tscObj
+        releaseTscObj(pReq->connKey.tscRid);
+        continue;
+      }
+
       pTscObj->authVer = pRsp->version;
 
       if (pTscObj->sysInfo != pRsp->sysInfo) {
diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index 7902d6029e..293349e2b3 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -147,6 +147,13 @@ int taos_set_notify_cb(TAOS *taos, __taos_notify_fn_t fp, void *param, int type)
       taosThreadMutexUnlock(&pObj->mutex);
       break;
     }
+    case TAOS_NOTIFY_USER_DROPPED: {
+      taosThreadMutexLock(&pObj->mutex);
+      pObj->userDroppedInfo.fp = fp;
+      pObj->userDroppedInfo.param = param;
+      taosThreadMutexUnlock(&pObj->mutex);
+      break;
+    }
     default: {
       terrno = TSDB_CODE_INVALID_PARA;
       releaseTscObj(*(int64_t *)taos);
diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index b4ce55b71d..fd39ae98d9 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -1652,7 +1652,7 @@ int32_t tSerializeSGetUserAuthRspImpl(SEncoder *pEncoder, SGetUserAuthRsp *pRsp)
   if (tEncodeI8(pEncoder, pRsp->superAuth) < 0) return -1;
   if (tEncodeI8(pEncoder, pRsp->sysInfo) < 0) return -1;
   if (tEncodeI8(pEncoder, pRsp->enable) < 0) return -1;
-  if (tEncodeI8(pEncoder, pRsp->reserve) < 0) return -1;
+  if (tEncodeI8(pEncoder, pRsp->dropped) < 0) return -1;
   if (tEncodeI32(pEncoder, pRsp->version) < 0) return -1;
 
   int32_t numOfCreatedDbs = taosHashGetSize(pRsp->createdDbs);
@@ -1767,7 +1767,7 @@ int32_t tDeserializeSGetUserAuthRspImpl(SDecoder *pDecoder, SGetUserAuthRsp *pRs
   if (tDecodeI8(pDecoder, &pRsp->superAuth) < 0) goto _err;
   if (tDecodeI8(pDecoder, &pRsp->sysInfo) < 0) goto _err;
   if (tDecodeI8(pDecoder, &pRsp->enable) < 0) goto _err;
-  if (tDecodeI8(pDecoder, &pRsp->reserve) < 0) goto _err;
+  if (tDecodeI8(pDecoder, &pRsp->dropped) < 0) goto _err;
   if (tDecodeI32(pDecoder, &pRsp->version) < 0) goto _err;
 
   int32_t numOfCreatedDbs = 0;
diff --git a/source/dnode/mnode/impl/src/mndUser.c b/source/dnode/mnode/impl/src/mndUser.c
index a82623ae1b..138820a3b8 100644
--- a/source/dnode/mnode/impl/src/mndUser.c
+++ b/source/dnode/mnode/impl/src/mndUser.c
@@ -2289,6 +2289,11 @@ int32_t mndValidateUserAuthInfo(SMnode *pMnode, SUserAuthVersion *pUsers, int32_
   for (int32_t i = 0; i < numOfUses; ++i) {
     SUserObj *pUser = mndAcquireUser(pMnode, pUsers[i].user);
     if (pUser == NULL) {
+      if (TSDB_CODE_MND_USER_NOT_EXIST == terrno) {
+        SGetUserAuthRsp rsp = {.dropped = 1};
+        memcpy(rsp.user, pUsers[i].user, TSDB_USER_LEN);
+        taosArrayPush(batchRsp.pArray, &rsp);
+      }
       mError("user:%s, failed to auth user since %s", pUsers[i].user, terrstr());
       continue;
     }
diff --git a/tests/script/api/passwdTest.c b/tests/script/api/passwdTest.c
index 06d2d3455f..4439c93790 100644
--- a/tests/script/api/passwdTest.c
+++ b/tests/script/api/passwdTest.c
@@ -47,8 +47,10 @@ typedef uint16_t VarDataLenT;
 void createUsers(TAOS *taos, const char *host, char *qstr);
 void passVerTestMulti(const char *host, char *qstr);
 void sysInfoTest(TAOS *taos, const char *host, char *qstr);
+void userDroppedTest(TAOS *taos, const char *host, char *qstr);
 
 int   nPassVerNotified = 0;
+int   nUserDropped = 0;
 TAOS *taosu[nRoot] = {0};
 char  users[nUser][USER_LEN] = {0};
 
@@ -56,11 +58,16 @@ void __taos_notify_cb(void *param, void *ext, int type) {
   switch (type) {
     case TAOS_NOTIFY_PASSVER: {
       ++nPassVerNotified;
-      printf("%s:%d type:%d user:%s ver:%d\n", __func__, __LINE__, type, param ? (char *)param : "NULL", *(int *)ext);
+      printf("%s:%d type:%d user:%s passVer:%d\n", __func__, __LINE__, type, param ? (char *)param : "NULL", *(int *)ext);
+      break;
+    }
+    case TAOS_NOTIFY_USER_DROPPED: {
+      ++nUserDropped;
+      printf("%s:%d type:%d user:%s dropped\n", __func__, __LINE__, type, param ? (char *)param : "NULL");
       break;
     }
     default:
-      printf("%s:%d unknown type:%d\n", __func__, __LINE__, type);
+      printf("%s:%d unknown notify type:%d\n", __func__, __LINE__, type);
       break;
   }
 }
@@ -201,7 +208,8 @@ int main(int argc, char *argv[]) {
   }
   createUsers(taos, argv[1], qstr);
   passVerTestMulti(argv[1], qstr);
-  sysInfoTest(taos, argv[1], qstr);
+  // sysInfoTest(taos, argv[1], qstr);
+  userDroppedTest(taos, argv[1], qstr);
 
   taos_close(taos);
   taos_cleanup();
@@ -223,9 +231,16 @@ void createUsers(TAOS *taos, const char *host, char *qstr) {
     int code = taos_set_notify_cb(taosu[i], __taos_notify_cb, users[i], TAOS_NOTIFY_PASSVER);
 
     if (code != 0) {
-      fprintf(stderr, "failed to run: taos_set_notify_cb for user:%s since %d\n", users[i], code);
+      fprintf(stderr, "failed to run: taos_set_notify_cb(TAOS_NOTIFY_PASSVER) for user:%s since %d\n", users[i], code);
     } else {
-      fprintf(stderr, "success to run: taos_set_notify_cb for user:%s\n", users[i]);
+      fprintf(stderr, "success to run: taos_set_notify_cb(TAOS_NOTIFY_PASSVER) for user:%s\n", users[i]);
+    }
+
+    code = taos_set_notify_cb(taosu[i], __taos_notify_cb, users[i], TAOS_NOTIFY_USER_DROPPED);
+    if (code != 0) {
+      fprintf(stderr, "failed to run: taos_set_notify_cb(TAOS_NOTIFY_USER_DROPPED) for user:%s since %d\n", users[i], code);
+    } else {
+      fprintf(stderr, "success to run: taos_set_notify_cb(TAOS_NOTIFY_USER_DROPPED) for user:%s\n", users[i]);
     }
 
     // alter pass for users
@@ -301,6 +316,7 @@ void passVerTestMulti(const char *host, char *qstr) {
 }
 
 void sysInfoTest(TAOS *taosRoot, const char *host, char *qstr) {
+  fprintf(stderr, "######## %s entry #########\n", __func__);
   TAOS *taos[nRoot] = {0};
   char  userName[USER_LEN] = "user0";
 
@@ -376,4 +392,48 @@ _REP:
   fprintf(stderr, "######## %s #########\n", __func__);
   fprintf(stderr, ">>> succeed to run sysInfoTest\n");
   fprintf(stderr, "######## %s #########\n", __func__);
+}
+
+void userDroppedTest(TAOS *taos, const char *host, char *qstr) {
+  // users
+  int nTestUsers = 1;  // nUser
+  for (int i = 0; i < nTestUsers; ++i) {
+    // sprintf(users[i], "user%d", i);
+    taosu[i] = taos_connect(host, users[i], "taos", NULL, 0);
+    if (taosu[i] == NULL) {
+      printf("failed to connect to server, user:%s, reason:%s\n", users[i], "null taos" /*taos_errstr(taos)*/);
+      exit(1);
+    }
+  }
+
+  for (int i = 0; i < nTestUsers; ++i) {
+    // drop user0 ... user${nUser}
+    sprintf(qstr, "drop user %s", users[i]);
+    queryDB(taos, qstr);
+  }
+
+  // calculate the nUserDropped for users
+  int nConn = nTestUsers;
+
+  for (int i = 0; i < 15; ++i) {
+    printf("%s:%d [%d] second(s) elasped, passVer notification received:%d, total:%d\n", __func__, __LINE__, i,
+           nUserDropped, nConn);
+    if (nUserDropped >= nConn) break;
+    sleep(1);
+  }
+
+  for (int i = 0; i < nTestUsers; ++i) {
+    taos_close(taosu[i]);
+    printf("%s:%d close taosu[%d]\n", __func__, __LINE__, i);
+    sleep(1);
+  }
+
+  fprintf(stderr, "######## %s #########\n", __func__);
+  if (nUserDropped >= nConn) {
+    fprintf(stderr, ">>> succeed to get user dropped notification since nNotify %d >= nConn %d\n", nUserDropped, nConn);
+  } else {
+    fprintf(stderr, ">>> failed to get user dropped notification since nNotify %d < nConn %d\n", nUserDropped, nConn);
+  }
+  fprintf(stderr, "######## %s #########\n", __func__);
+  sleep(300);
 }
\ No newline at end of file