China has established "identifiability" as the identification standard of personal information in years of legislative practice, and the regulation of personal information refers to the European Union "General Data Protection Regulations", and applies a higher standard to the direct identification of personal information and indirect identification of personal information. However, the current legislation of our country has not clearly explained the connotation and extension of indirect identification of personal information, which brings great obstacles to the application of relevant legislation. The reason lies in the deficiency of the court's cognitive ability, the limitation of the existing information processing order and the restriction of our traditional values. In the future, China's personal information protection legislation should improve the identification and regulation mechanism of indirect identification of personal information from two aspects of connotation and extension.