diff --git a/base.go b/base.go
index e8c6f07..d070b35 100644
--- a/base.go
+++ b/base.go
@@ -15,7 +15,6 @@ func buildBodyRequest(ver, rawurl string, body *Body) *http.Request {
 	if body.IOBody == nil {
 		req, err = http.NewRequest(ver, rawurl, nil)
 	} else {
-		contentType = TypeURLENCODED
 		var bodybuf *bytes.Buffer
 		switch body.IOBody.(type) {
 		case []byte:
@@ -33,7 +32,17 @@ func buildBodyRequest(ver, rawurl string, body *Body) *http.Request {
 	}
 
 	if body.ContentType != "" {
-		contentType = body.ContentType
+		if body.ContentType == TypeContentEmpty {
+			contentType = ""
+		} else {
+			contentType = body.ContentType
+		}
+	} else {
+		if contentType == "" {
+			if ver == "POST" || ver == "PUT" || ver == "Patch" {
+				contentType = TypeURLENCODED
+			}
+		}
 	}
 
 	if contentType != "" {
diff --git a/session.go b/session.go
index aaedacf..b45dc04 100644
--- a/session.go
+++ b/session.go
@@ -50,6 +50,8 @@ const (
 	TypeURLENCODED = "application/x-www-form-urlencoded"
 	// TypeForm PostForm类型
 	TypeForm = TypeURLENCODED
+	// TypeContentEmpty 没有Form的类型 Content
+	TypeContentEmpty = "ContentEmpty"
 	// TypeFormData 类型
 	TypeFormData = "multipart/form-data"
 	// HeaderKeyHost Host