diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 88b38d5e38..8432855c6f 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -505,7 +505,9 @@ static int32_t mndCheckInChangeDbCfg(SMnode *pMnode, SDbCfg *pOldCfg, SDbCfg *pN
     return -1;
   }
 
-  if (pNewCfg->sstTrigger < TSDB_MIN_STT_TRIGGER || pNewCfg->sstTrigger > TSDB_MAX_STT_TRIGGER) return -1;
+  if (pNewCfg->sstTrigger != pOldCfg->sstTrigger &&
+      (pNewCfg->sstTrigger < TSDB_MIN_STT_TRIGGER || pNewCfg->sstTrigger > TSDB_MAX_STT_TRIGGER))
+    return -1;
   if (pNewCfg->minRows < TSDB_MIN_MINROWS_FBLOCK || pNewCfg->minRows > TSDB_MAX_MINROWS_FBLOCK) return -1;
   if (pNewCfg->maxRows < TSDB_MIN_MAXROWS_FBLOCK || pNewCfg->maxRows > TSDB_MAX_MAXROWS_FBLOCK) return -1;
   if (pNewCfg->minRows > pNewCfg->maxRows) return -1;