The first chapter of foreign-related contracts and applicable laws are Concerning foreign-related contracts, standard "The standards", "the nationality of the business to standard", Our foreign factors of foreign-related contracts in China mainly by the supreme people's court "carry out about carrying out (civil law of the People's Republic) of some issues opinion (try out)" regulation shall first In this paper, the applicable law of contract theory has carried on the earnest analysis, the contract law applicable methods are the same and the theory of segmentation, objective and subjective theory, including proper covering appropriate theory of international contract theory is applicable law and the present problem, achieved the same theory and the theory of segmentation and subjective and objective theory