民法作为私法和权利法,强调当事人具有私法自治权。但是这种“自由”并不是没有限制的,如果民事行为违反法律、公序良俗,则该行为在私法上所要达到的目的将不被肯定,即该民事行为属于无效民事行为。文章通过比较法的方法,通过对主要大陆法系国家关于“违反法律的民事行为效力”问题的法律规定,浅析违反法律的民事行为的效力问题。 As a private law and a law of rights, civil law emphasizes that the parties have the power of private law to exercise autonomy. However, this “freedom” is not unlimited. If a civil act violates laws, public order and good habits, the purpose of the act to be achieved in the private law will not be affirmed. That is, the civil act is an invalid civil act. Through the method of comparative law, the article analyzes the validity of the civil action in violation of the law through the legal provisions on the validity of the civil act in violation of law in the main civil law countries.