The overarching requirements set forth in Articles 30 and 31 of the Law on Foreign Relations of the People’s Republic of China urgently require a response from Private International Law. As a constitutionrelated law and the basic law of and foreign-related laws and regulations, the provisions of the Law on Foreign Relations have a unifying eff ect on the application rule of treaties under Private International Law. The clauses of the primacy of international treaties represented by Article 142(2) of the former General Principles of the Civil Law of the People’s Republic of China is in practice both an authorization clause under the mode of direct application of international treaties and a private inter-legal law under the mode of indirect application of international treaties, but many contradictions have arisen in judicial practice due to the problem of its expression. The provisons in Interpretation by the Supreme People’s Court of Several Issues Concerning the Application of International Treaties and International Practices in the Trial of Foreign-Related Civil and Commercial Cases are just a kind of expedient, which does not adequately respond to the requirements of the Law on Foreign Relations. Provisions concerning the application of treaties under Private International Law should be optimized and presented in the future in the form of articles or provisions within the law.