diff --git a/source/dnode/mnode/impl/src/mndVgroup.c b/source/dnode/mnode/impl/src/mndVgroup.c
index a6e52caf1f..4a6f0d14da 100644
--- a/source/dnode/mnode/impl/src/mndVgroup.c
+++ b/source/dnode/mnode/impl/src/mndVgroup.c
@@ -507,7 +507,7 @@ static int32_t mndGetAvailableDnode(SMnode *pMnode, SDbObj *pDb, SVgObj *pVgroup
   for (int32_t v = 0; v < pVgroup->replica; ++v) {
     SVnodeGid *pVgid = &pVgroup->vnodeGid[v];
     SDnodeObj *pDnode = taosArrayGet(pArray, v);
-    if (pDnode == NULL || pDnode->numOfVnodes > pDnode->numOfSupportVnodes) {
+    if (pDnode == NULL || pDnode->numOfVnodes >= pDnode->numOfSupportVnodes) {
       terrno = TSDB_CODE_MND_NO_ENOUGH_DNODES;
       return -1;
     }
@@ -891,7 +891,7 @@ static int32_t mndAddVnodeToVgroup(SMnode *pMnode, STrans *pTrans, SVgObj *pVgro
     }
     if (used) continue;
 
-    if (pDnode == NULL || pDnode->numOfVnodes > pDnode->numOfSupportVnodes) {
+    if (pDnode == NULL || pDnode->numOfVnodes >= pDnode->numOfSupportVnodes) {
       terrno = TSDB_CODE_MND_NO_ENOUGH_DNODES;
       return -1;
     }
diff --git a/tests/script/tsim/dnode/balance2.sim b/tests/script/tsim/dnode/balance2.sim
index f677d3925c..3f5a42d4d3 100644
--- a/tests/script/tsim/dnode/balance2.sim
+++ b/tests/script/tsim/dnode/balance2.sim
@@ -4,11 +4,11 @@ system sh/deploy.sh -n dnode2 -i 2
 system sh/deploy.sh -n dnode3 -i 3
 system sh/deploy.sh -n dnode4 -i 4
 system sh/deploy.sh -n dnode5 -i 5
-system sh/cfg.sh -n dnode1 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode2 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode3 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode4 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode5 -c supportVnodes -v 4
+system sh/cfg.sh -n dnode1 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode2 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode3 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode4 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode5 -c supportVnodes -v 5
 
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
diff --git a/tests/script/tsim/vnode/stable_balance_replica1.sim b/tests/script/tsim/vnode/stable_balance_replica1.sim
index f124979397..84190a3be0 100644
--- a/tests/script/tsim/vnode/stable_balance_replica1.sim
+++ b/tests/script/tsim/vnode/stable_balance_replica1.sim
@@ -3,10 +3,10 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/deploy.sh -n dnode2 -i 2
 system sh/deploy.sh -n dnode3 -i 3
 system sh/deploy.sh -n dnode4 -i 4
-system sh/cfg.sh -n dnode1 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode2 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode3 -c supportVnodes -v 4
-system sh/cfg.sh -n dnode4 -c supportVnodes -v 4
+system sh/cfg.sh -n dnode1 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode2 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode3 -c supportVnodes -v 5
+system sh/cfg.sh -n dnode4 -c supportVnodes -v 5
 
 $dbPrefix = br1_db
 $tbPrefix = br1_tb