Public order and good customs mean that the behavior of civil subjects should abide by public order and good customs, and must not violate the public order of the country and the universal morality of society. Public order refers to public order, which refers to the general order necessary for the existence and development of national society; Good custom refers to good custom, which refers to the general morality necessary for the existence and development of a country and society.

Public order and good customs are concepts used in the civil codes of French, Japanese, Italian and other civil law countries, as well as China, Macau and Taiwan Province Province of China.

The principle of public order and good customs is widely used in judicial practice and is of great significance in civil trials.

According to scholars' research, the principle of public order and good customs originated from Roman law. In Roman law, the so-called public order means national security and the fundamental interests of citizens; Good custom is the general moral standard of citizens, which has a wide meaning and changes with time, not invariable. Acts that violate public order and good customs are legally invalid. This principle is clearly stipulated in the civil legislation of many countries and regions in modern times.

The General Principles of Civil Law of People's Republic of China (PRC) mentions public order and good customs many times. Article 8 stipulates that civil subjects engaged in civil activities shall not violate the law or public order and good customs. Article 10 stipulates that civil disputes shall be handled according to law; What is not stipulated by law can be applied to customs, but it must not violate public order and good customs. Article 153 stipulates that civil legal acts that violate public order and good customs are invalid.