diff --git a/src/mnode/src/mgmtDb.c b/src/mnode/src/mgmtDb.c
index c6506a350a56357b4f21d5ea0fa4d38bc13c74c2..d8dfcbe213304ad4f19a441a7781b2ed98970679 100644
--- a/src/mnode/src/mgmtDb.c
+++ b/src/mnode/src/mgmtDb.c
@@ -811,20 +811,20 @@ static SDbCfg mgmtGetAlterDbOption(SDbObj *pDb, SCMAlterDbMsg *pAlter) {
   if (replications > 0 && replications != pDb->cfg.replications) {
     mTrace("db:%s, replications:%d change to %d", pDb->name, pDb->cfg.replications, replications);
     newCfg.replications = replications;
-  } 
 
-  if (replications > mgmtGetDnodesNum()) {
-    mError("db:%s, no enough dnode to change replica:%d", pDb->name, replications);
-    terrno = TSDB_CODE_NO_ENOUGH_DNODES;
-  }
+    if (replications > mgmtGetDnodesNum()) {
+      mError("db:%s, no enough dnode to change replica:%d", pDb->name, replications);
+      terrno = TSDB_CODE_NO_ENOUGH_DNODES;
+    }
 
-  if (pDb->cfg.replications - replications >= 2) {
-    mError("db:%s, replica number can't change from 3 to 1", pDb->name, replications);
-    terrno = TSDB_CODE_INVALID_OPTION;
+    if (pDb->cfg.replications - replications >= 2) {
+      mError("db:%s, replica number can't change from 3 to 1", pDb->name, replications);
+      terrno = TSDB_CODE_INVALID_OPTION;
+    }
   }
-  
-  if (walLevel < TSDB_MIN_WAL_LEVEL || walLevel > TSDB_MAX_WAL_LEVEL) {
-    mError("db:%s, wal level should be between 0-2", pDb->name);
+
+  if (walLevel > 0 && (walLevel < TSDB_MIN_WAL_LEVEL || walLevel > TSDB_MAX_WAL_LEVEL)) {
+    mError("db:%s, wal level %d should be between 0-2, origin:%d", pDb->name, walLevel, pDb->cfg.walLevel);
     terrno = TSDB_CODE_INVALID_OPTION;
   }