无论是我国的司法实践还是法学理论,违反控制的法律行为大都被认定为无效,该行为在私法上也是没有效力的。当然,国家对私法行为进行引导、调整是社会经济管理职能之所在,但若超出一定限度、范围,对私法领域而言是不适当的。法律行为的本质是私法自治。国家如果过度干预私法活动,一旦私法的基本价值得不到保障,人民大众的自由意志持久受到禁锢,社会主义市场经济将变成一滩死水,社会无从发展。本文在坚持私法自治的原则下,以乘坐黑车引发的相关法律问题为例对违反控制的法律行为之效力进行探讨。 No matter in our country’s judicial practice or legal theory, most of the legal acts that violate the control are regarded as invalid. This act is also ineffective in the private law. Of course, since the state guides private-sector behavior and adjusts itself to the functions of social and economic management, it is not appropriate for the private-law sector to exceed certain limits and scope. The essence of legal acts is the autonomy of private law. If the state overly interferes in the activities of private law, once the basic values ​​of private law are not guaranteed, the free will of the people will be imprisoned for a long time and the socialist market economy will become a beach of stagnant water, making the society impossible. This article insists on the principle of private law autonomy, and takes the black car-related legal issues as an example to discuss the effectiveness of the legal act in violation of control.