The integration of civil and commercial affairs refers to the unified legislation of civil and commercial affairs, and the commercial contents are incorporated into the civil code or appear in the form of separate regulations. Countries that adopt civil and commercial integration can be divided into two styles: complete integration and incomplete integration. The complete integration of civil and commercial law means that most of the contents of commercial law are incorporated into the civil code, such as Switzerland and Italy; Incomplete integration of civil and commercial laws means that some commercial laws are incorporated into the civil code, while the main contents of commercial laws such as companies, bills, insurance and maritime businesses are legislated separately, and the typical representative is the civil law of Taiwan Province Province. In the main code system of civil law system, there are two legislative modes: civil and commercial integration and civil and commercial separation. Among them, the legislative style of civil and commercial separation is mostly, that is, there are commercial codes besides the civil code, such as Germany, Japan, France, Portugal and so on.