diff --git a/README.MD b/README.MD
index bda1fb7..c4a2674 100644
--- a/README.MD
+++ b/README.MD
@@ -131,7 +131,7 @@ r.Body().Set("beginDate", "2022-03-01").Set("endDate", "2022-03-03")
 ```
 
 #### 字符串赋值
-通过此方法直接赋值json数据
+json格式不要使用此方法
 ```go
 bodydata:=`{"devSn":"230000000008","type":"day"}`
 r.Body().SetString(bodydata)
diff --git a/simpleRequest.go b/simpleRequest.go
index 54afb2c..2dda748 100644
--- a/simpleRequest.go
+++ b/simpleRequest.go
@@ -210,8 +210,9 @@ func (s *SimpleRequest) initBody() {
 		jsonData, err := json.Marshal(s.tempBody)
 		if err == nil {
 			s.body = bytes.NewReader(jsonData)
+		} else {
+			s.body = bytes.NewReader([]byte("{}"))
 		}
-		s.body = bytes.NewReader(jsonData)
 	case contentTypeData == xmlDataType || contentTypeData == textPlainType || contentTypeData == javaScriptType:
 		data, _ := s.tempBody[stringBodyType].(string)
 		s.body = strings.NewReader(data)