進入settings=>repository=>protected branches里，修改Allowed to push為Developers + Maintainers 或者直接點擊Unprotect.
developer權限也可提交代碼
master分支下修改了文件，計划push，發現沒有權限
remote: GitLab: You are not allowed to push code to protected branches on this project. ! [remote rejected] master -> master (pre-receive hook declined)
修改文件並添加
git add .
git commit -m "m"
git checkout -b update_fastjosn_version //新建分支
git push //此處提示錯誤
git push --set-upstream origin update_fastjson_version //再次OK了
可以看到push成功了，再登陸gitlab，新建一個merge request就行了，讓有merge權限的人merge一下。