China's earliest form of legislation on civil and commercial matters.

China's earliest form of legislation to unify civil and commercial affairs was during the period of the Nanjing National Government.

The codification of the civil code is divided into two modes: "civil and commercial separation" and "civil and commercial unity". The earliest country in the world to establish the "separate civil and commercial" model was France in the 18th century, during the reign of Louis XIV. In 1901, Switzerland incorporated the commercial law into the civil code, creating the first system of "civil and commercial unity". In China, during the late Qing Dynasty and the Beiyang Government, a separate civil and commercial system was adopted, with separate drafts of the civil and commercial laws.

In 1929, in line with the international trend of "civil and commercial" legislation, the Political Conference of the Central Committee of the Kuomintang passed a resolution to change the principle of "civil and commercial separation" to "civil and commercial unity".

The reason for the change was that: since ancient times, China has been mainly a natural economy, and has not formed an independent class of merchants, for which there is no need to stipulate a separate commercial law; the boundaries between the commercial law and the civil law are unclear, and the repetition of the provisions would hinder their application, and so on.

Therefore, the Nanjing national government in the codification of the overall use of civil and commercial style, the relevant content of the commercial law into the civil code, the civil code can not be integrated into the content of the commercial law, as the relationship between the civil law law attached to the civil code. What is not suitable to be regulated by the civil law, such as companies, bills, insurance, maritime commerce, banking and other matters, are regulated by separate commercial laws and regulations.

Civil-commercial unification refers to the unification of civil and commercial legislation, the commercial aspects of the civil code, or in the form of a separate statute. Countries that have adopted civil-commercial unification can be further divided into civil-commercial full unification and civil-commercial incomplete unification.

The complete unity of civil and commercial law is to incorporate most of the content of commercial law into the civil code, such as Switzerland, Italy, etc.; the incomplete unity of civil and commercial law is to incorporate part of the content of commercial law into the civil code, while the main content of commercial law such as companies, bills, insurance, maritime law, and so on, the main content of the use of stand-alone legislation, a typical representative of the Taiwan civil law.

In the main code system of the civil law system, there are civil and commercial unity, civil and commercial separation of two legislative models. Among them, the use of civil and commercial separation of the majority of the legislative system, that is, outside the civil code is also codified in the commercial code, such as Germany, Japan, France, Portugal and so on.