diff --git a/kfsend_test.go b/kfsend_test.go
index 3cc2760..469d719 100644
--- a/kfsend_test.go
+++ b/kfsend_test.go
@@ -2,27 +2,12 @@ package main
 
 import (
 	"fmt"
-	"math/rand"
 	"testing"
 	"time"
 )
 
 var toUser = "oUN420bxqFqlx0ZQHciUOesZO3PE"
 
-func randinit() {
-	rand.Seed(time.Now().UnixNano())
-}
-
-var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
-
-func RandStringRunes(n int) string {
-	b := make([]rune, n)
-	for i := range b {
-		b[i] = letterRunes[rand.Intn(len(letterRunes))]
-	}
-	return string(b)
-}
-
 func TestSendTxt(t *testing.T) {
 	SetupConfig()
 	msg := fmt.Sprintf("测试消息， %s ", time.Now().String())
diff --git a/randomstring.go b/randomstring.go
new file mode 100644
index 0000000..d0a8f27
--- /dev/null
+++ b/randomstring.go
@@ -0,0 +1,20 @@
+package main
+
+import (
+	"math/rand"
+	"time"
+)
+
+func randinit() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func RandStringRunes(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letterRunes[rand.Intn(len(letterRunes))]
+	}
+	return string(b)
+}