diff --git a/randomx.go b/randomx.go
index 1db59ef..db874f3 100644
--- a/randomx.go
+++ b/randomx.go
@@ -48,6 +48,24 @@ func RandomStr(length int) (string, error) {
 	return string(result), nil
 }
 
+func RandomNum(length int) (string, error) {
+	if length <= 0 {
+		return "", errors.New("位数必须大于0")
+	}
+	str := "0123456789"
+
+	bytes := []rune(str)
+
+	var result = make([]rune, 0, length)
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	for i := 0; i < length; i++ {
+		result = append(result, bytes[r.Intn(len(bytes))])
+	}
+
+	return string(result), nil
+}
+
 // 生成指定空间的随机数
 func RandomInt(min, max int) (int, error) {
 	c := max - min
diff --git a/randomx_test.go b/randomx_test.go
index 27925b0..a0e2694 100644
--- a/randomx_test.go
+++ b/randomx_test.go
@@ -6,6 +6,27 @@ import (
 	"code.yun.ink/pkg/randomx"
 )
 
+func TestRandomRune(t *testing.T) {
+	str, err := randomx.RandomRune(20)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	t.Log(str)
+}
+
+func TestRandomStr(t *testing.T) {
+	str, err := randomx.RandomStr(10)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if len(str) == 10 {
+		t.Log("正常")
+		t.Log(str)
+	} else {
+		t.Fatal("不正常", str)
+	}
+}
+
 func TestRandomInt(t *testing.T) {
 	i, err := randomx.RandomInt(100, 101)
 	if err != nil {
@@ -17,15 +38,3 @@ func TestRandomInt(t *testing.T) {
 		t.Fatal("不正常", i)
 	}
 }
-
-func TestRandomStr(t *testing.T) {
-	str, err := randomx.RandomStr(10)
-	if err != nil {
-		t.Fatal(err.Error())
-	}
-	if len(str) == 10 {
-		t.Log("正常")
-	} else {
-		t.Fatal("不正常", str)
-	}
-}