diff --git a/src/mnode/inc/mnodeDnode.h b/src/mnode/inc/mnodeDnode.h
index 10f79582d4a492622e1cc425d69aaa95966846d7..941bfca9e61cd2a5dec5942847277c5a9a78913c 100644
--- a/src/mnode/inc/mnodeDnode.h
+++ b/src/mnode/inc/mnodeDnode.h
@@ -66,6 +66,7 @@ void    mnodeCleanupDnodes();
 
 int32_t mnodeGetDnodesNum();
 int32_t mnodeGetOnlinDnodesCpuCoreNum();
+int32_t mnodeGetVnodeDnodesNum();
 int32_t mnodeGetOnlineDnodesNum();
 void    mnodeGetOnlineAndTotalDnodesNum(int32_t *onlineNum, int32_t *totalNum);
 void *  mnodeGetNextDnode(void *pIter, SDnodeObj **pDnode);
diff --git a/src/mnode/src/mnodeDb.c b/src/mnode/src/mnodeDb.c
index 13afd1c29894fea07e5c269eee53b36a386ee442..cc0b18c9b7047a718f6244cbe20ce76789a21a4c 100644
--- a/src/mnode/src/mnodeDb.c
+++ b/src/mnode/src/mnodeDb.c
@@ -339,8 +339,8 @@ static int32_t mnodeCheckDbCfg(SDbCfg *pCfg) {
     return TSDB_CODE_MND_INVALID_DB_OPTION;
   }
 
-  if (pCfg->replications > mnodeGetDnodesNum()) {
-    mError("no enough dnode to config replica: %d, #dnodes: %d", pCfg->replications, mnodeGetDnodesNum());
+  if (pCfg->replications > mnodeGetVnodeDnodesNum()) {
+    mError("no enough dnode to config replica: %d, #dnodes: %d", pCfg->replications, mnodeGetVnodeDnodesNum());
     return TSDB_CODE_MND_INVALID_DB_OPTION;
   }
 
@@ -1057,7 +1057,7 @@ static SDbCfg mnodeGetAlterDbOption(SDbObj *pDb, SAlterDbMsg *pAlter) {
       terrno = TSDB_CODE_MND_INVALID_DB_OPTION;
     }
 
-    if (replications > mnodeGetDnodesNum()) {
+    if (replications > mnodeGetVnodeDnodesNum()) {
       mError("db:%s, no enough dnode to change replica:%d", pDb->name, replications);
       terrno = TSDB_CODE_MND_NO_ENOUGH_DNODES;
     }
diff --git a/src/mnode/src/mnodeDnode.c b/src/mnode/src/mnodeDnode.c
index 58e9f8b749b3df1f58fbd3e67f29dacb379ca0bc..c9ea2f1af4be64d5301e77e44f30d2f7f7833dd3 100644
--- a/src/mnode/src/mnodeDnode.c
+++ b/src/mnode/src/mnodeDnode.c
@@ -271,6 +271,21 @@ int32_t mnodeGetOnlineDnodesNum() {
   return onlineDnodes;
 }
 
+int32_t mnodeGetVnodeDnodesNum() {
+  SDnodeObj *pDnode = NULL;
+  void *     pIter = NULL;
+  int32_t    numOfDnodes = 0;
+
+  while (1) {
+    pIter = mnodeGetNextDnode(pIter, &pDnode);
+    if (pDnode == NULL) break;
+    if (pDnode->alternativeRole != TAOS_DN_ALTERNATIVE_ROLE_MNODE) numOfDnodes++;
+    mnodeDecDnodeRef(pDnode);
+  }
+
+  return numOfDnodes;
+}
+
 void mnodeGetOnlineAndTotalDnodesNum(int32_t *onlineNum, int32_t *totalNum) {
   SDnodeObj *pDnode = NULL;
   void *     pIter = NULL;