diff --git a/starainrt.go b/starainrt.go
index 465ae28..d2ec483 100644
--- a/starainrt.go
+++ b/starainrt.go
@@ -45,6 +45,13 @@ func IsFile(fpath string) bool {
 	}
 	return !s.IsDir()
 }
+func IsFolder(fpath string) bool {
+	s, err := os.Stat(fpath)
+	if err != nil {
+		return false
+	}
+	return s.IsDir()
+}
 func ReWriteFileByKV(filepath, rem, conn, ret string, kv map[string]string) bool {
 	var outputstr string
 	var ataru bool = false