diff --git a/README.md b/README.md
index e55da517..40604546 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 #### QQ、微信、支付宝的Golang版本SDK
 
-[![Golang](https://img.shields.io/badge/golang-1.13+-brightgreen.svg)](https://golang.google.cn)
+[![Golang](https://img.shields.io/badge/golang-1.14+-brightgreen.svg)](https://golang.google.cn)
 [![GoDoc](https://img.shields.io/badge/doc-go.dev-informational.svg)](https://pkg.go.dev/github.com/iGoogle-ink/gopay)
 [![Drone CI](https://cloud.drone.io/api/badges/iGoogle-ink/gopay/status.svg)](https://cloud.drone.io/iGoogle-ink/gopay)
 [![GitHub Release](https://img.shields.io/github/v/release/iGoogle-ink/gopay)](https://github.com/iGoogle-ink/gopay/releases)
diff --git a/alipay/client.go b/alipay/client.go
index 1a3f2b48..d0da7bbb 100644
--- a/alipay/client.go
+++ b/alipay/client.go
@@ -69,7 +69,7 @@ func (a *Client) PostAliPayAPISelfV2(bm gopay.BodyMap, method string, aliRsp int
 		bs, bodyBs []byte
 	)
 	// check if there is biz_content
-	bz := bm.Get("biz_content")
+	bz := bm.GetInterface("biz_content")
 	if bzBody, ok := bz.(gopay.BodyMap); ok {
 		if bodyBs, err = json.Marshal(bzBody); err != nil {
 			return fmt.Errorf("json.Marshal(%v)：%w", bzBody, err)
diff --git a/body_map.go b/body_map.go
index 9a2c4591..22d870ad 100644
--- a/body_map.go
+++ b/body_map.go
@@ -69,14 +69,9 @@ func (bm BodyMap) SetFormFile(fieldName string, filePath string) (err error) {
 	return nil
 }
 
-// 获取原始参数
-func (bm BodyMap) Get(key string) interface{} {
-	if bm == nil {
-		return nil
-	}
-	mu.RLock()
-	defer mu.RUnlock()
-	return bm[key]
+// 获取参数，同 GetString()
+func (bm BodyMap) Get(key string) string {
+	return bm.GetString(key)
 }
 
 // 获取参数转换string
@@ -97,6 +92,16 @@ func (bm BodyMap) GetString(key string) string {
 	return v
 }
 
+// 获取原始参数
+func (bm BodyMap) GetInterface(key string) interface{} {
+	if bm == nil {
+		return nil
+	}
+	mu.RLock()
+	defer mu.RUnlock()
+	return bm[key]
+}
+
 // 删除参数
 func (bm BodyMap) Remove(key string) {
 	mu.Lock()
diff --git a/constant.go b/constant.go
index 7d2add18..886e96d2 100644
--- a/constant.go
+++ b/constant.go
@@ -7,7 +7,7 @@ const (
 	OK       = "OK"
 	DebugOff = 0
 	DebugOn  = 1
-	Version  = "1.5.29"
+	Version  = "1.5.30"
 )
 
 type DebugSwitch int8
diff --git a/release_note.txt b/release_note.txt
index 56d3bc4d..1a96d451 100644
--- a/release_note.txt
+++ b/release_note.txt
@@ -1,3 +1,8 @@
+版本号：Release 1.5.30
+修改记录：
+   (1) BodyMap：恢复 bm.Get() 方法获取的是string类型，增加 bm.GetInterface()
+   (2) 微信：新增V3版本退款查询接口
+
 版本号：Release 1.5.29
 发布时间：2021/02/27 22:49
 修改记录：