Procedural law is a procedural law formulated to realize substantive rights and obligations, such as criminal procedure law, civil procedure law and so on. Of course, this division is not absolute. Some procedural issues are often stipulated in substantive law, while there are many provisions on the rights and obligations of litigation subjects in procedural law. Procedural law is the guarantee for the correct implementation of substantive law, and judicial activities are the comprehensive application of substantive law and procedural law.