diff --git a/internal/util/paramtable/component_param.go b/internal/util/paramtable/component_param.go
index f285c75a3d..8cfbbdf010 100644
--- a/internal/util/paramtable/component_param.go
+++ b/internal/util/paramtable/component_param.go
@@ -1382,7 +1382,7 @@ func (p *dataNodeConfig) initFlowGraphMaxParallelism() {
 }
 
 func (p *dataNodeConfig) initFlushInsertBufferSize() {
-	bufferSize := p.Base.LoadWithDefault2([]string{"DATA_NODE_IBUFSIZE", "datanode.segment.insertBufSize"}, "0")
+	bufferSize := p.Base.LoadWithDefault2([]string{"DATA_NODE_IBUFSIZE", "datanode.segment.insertBufSize"}, "16777216")
 	bs, err := strconv.ParseInt(bufferSize, 10, 64)
 	if err != nil {
 		panic(err)