diff --git a/array_test.go b/array_test.go
deleted file mode 100644
index 39bde6d..0000000
--- a/array_test.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// Package wrapper ...
-//
-// Description : wrapper ...
-//
-// Author : go_developer@163.com<白茶清欢>
-//
-// Date : 2023-06-11 21:12
-package wrapper
-
-import (
-	"fmt"
-	"reflect"
-	"testing"
-)
-
-func TestArray(t *testing.T) {
-	val := []interface{}{1, 2, 3}
-	fmt.Println(Array(val).IsValid())
-	fmt.Println(Array(val).ItemIsInterface())
-	valInt := []int{1, 2, 3, 1, 4, 5, 6, 7, 7, 6, 9}
-	fmt.Println(Array(valInt).Unique())
-	a := map[string]interface{}{"name": "zhang"}
-	b := a
-	c := map[string]interface{}{"name": "de"}
-	fmt.Println(reflect.DeepEqual(b, c))
-	fmt.Println(reflect.DeepEqual(a, b))
-	fmt.Println(Array(valInt).In("1"))
-	fmt.Println(Array(valInt).In(1))
-	fmt.Println(Array(valInt).In(2))
-	fmt.Println(Array(valInt).In(7))
-	fmt.Println(Array(valInt).In(20))
-}
diff --git a/string.go b/string.go
index 47c5a83..4f804cc 100644
--- a/string.go
+++ b/string.go
@@ -9,6 +9,7 @@ package wrapper
 
 import (
 	"crypto/md5"
+	"encoding/hex"
 	"errors"
 	"git.zhangdeman.cn/zhangdeman/serialize"
 	"git.zhangdeman.cn/zhangdeman/util"
@@ -999,7 +1000,7 @@ func (str String) Md5() StringResult {
 		}
 	}
 	return StringResult{
-		Value: string(h.Sum(nil)),
+		Value: hex.EncodeToString(h.Sum(nil)),
 		Err:   nil,
 	}
 }