diff --git a/script/utils.go b/script/utils.go
index 9b53906..7fddfec 100644
--- a/script/utils.go
+++ b/script/utils.go
@@ -22,10 +22,10 @@ func GetIpAddress() string {
 const char = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 
 func RandChar(size int) string {
-	rand.NewSource(time.Now().UnixNano()) // 产生随机种子
+	source := rand.NewSource(time.Now().UnixNano()) // 产生随机种子
 	var s bytes.Buffer
 	for i := 0; i < size; i++ {
-		s.WriteByte(char[rand.Int63()%int64(len(char))])
+		s.WriteByte(char[source.Int63()%int64(len(char))])
 	}
 	return s.String()
 }