diff --git a/helper/str_helper.go b/helper/str_helper.go
index 8d63523..eeb0773 100644
--- a/helper/str_helper.go
+++ b/helper/str_helper.go
@@ -9,11 +9,12 @@ package helper
 
 import (
 	"math/rand"
+	"strings"
 	"time"
 	"unicode"
 
-	"github.com/rs/xid"
 	"git.hexq.cn/tiglog/golib/crypto/gmd5"
+	"github.com/rs/xid"
 )
 
 // 是否是字符串
@@ -51,6 +52,49 @@ func LcFirst(str string) string {
 	return ""
 }
 
+// 驼峰转蛇形, XxYy => xx_yy
+func SnakeString(str string) string {
+	data := make([]byte, 0, len(str)*2)
+	j := false
+	num := len(str)
+	for i := 0; i < num; i++ {
+		d := str[i]
+		if i > 0 && d >= 'A' && d <= 'Z' && j {
+			data = append(data, '_')
+		}
+		if d != '_' {
+			j = true
+		}
+		data = append(data, d)
+	}
+	return strings.ToLower(string(data[:]))
+}
+
+// 蛇形转驼峰, xx_yy => XxYy
+func CamelString(str string) string {
+	data := make([]byte, 0, len(str))
+	j := false
+	k := false
+	num := len(str) - 1
+	for i := 0; i <= num; i++ {
+		d := str[i]
+		if k == false && d >= 'A' && d <= 'Z' {
+			k = true
+		}
+		if d >= 'a' && d <= 'z' && (j || k == false) {
+			d = d - 32
+			j = false
+			k = true
+		}
+		if k && d == '_' && num > i && str[i+1] >= 'a' && str[i+1] <= 'z' {
+			j = true
+			continue
+		}
+		data = append(data, d)
+	}
+	return string(data[:])
+}
+
 // 乱序字符串
 func Shuffle(str string) string {
 	if str == "" {
diff --git a/helper/str_helper_test.go b/helper/str_helper_test.go
index 3908917..5df5b4f 100644
--- a/helper/str_helper_test.go
+++ b/helper/str_helper_test.go
@@ -118,3 +118,15 @@ func TestUniq(t *testing.T) {
 	gtest.NotNil(t, s90)
 	// fmt.Println(s60, s70, s80, s90)
 }
+
+func TestSnake(t *testing.T) {
+	s1 := "XxYy"
+	r1 := helper.SnakeString(s1)
+	gtest.Equal(t, "xx_yy", r1)
+}
+
+func TestCamel(t *testing.T) {
+	s1 := "xx_yy"
+	r1 := helper.CamelString(s1)
+	gtest.Equal(t, "XxYy", r1)
+}