diff --git a/kernel/model/updater.go b/kernel/model/updater.go
index 37eb39e16..7dffef0b9 100644
--- a/kernel/model/updater.go
+++ b/kernel/model/updater.go
@@ -147,7 +147,7 @@ func downloadInstallPkg(pkgURL, checksum string) {
 
 	logging.LogInfof("downloading install package [%s]", pkgURL)
 	client := req.C().SetTimeout(60 * time.Minute)
-	err := client.NewParallelDownload(pkgURL).SetConcurrency(8).SetSegmentSize(1024 * 1024 * 4).
+	err := client.NewParallelDownload(pkgURL).SetConcurrency(8).SetSegmentSize(1024 * 1024 * 2).
 		SetOutputFile(savePath).Do()
 	if nil != err {
 		logging.LogErrorf("download install package failed: %s", err)