Abstract: The classification of URT (urban rail transit) systems serves as the fundamental basis for implementing them as a strategic backbone of public transportation. The existing classification standards for URT in China are outdated. In the context of the flourishing development of URT technology and the increasing diversification of passenger travel demands, it is necessary to study and develop national standards for the classification of URT in China.Method: The classification rules of WTO (World Trade Organization), USA, Europe, and foreign social organizations are introduced. The current classification standard in China, CJJ/T 1142007 Classification Standard for Urban Public Transportation, is discussed and its shortcomings are identified. The classification of URT systems in foreign countries is also presented. The design objectives, classification rules, basic attributes and technical characteristics of URT systems applicable to the development of national standards for URT classification in China are analyzed. Result & Conclusion: The public nature of URT in China determines that its classification should be mandatory and foundational, with reference to foreign classification rules and methods. The drafting of national standards for URT classification should align with existing national standards, industry standards, engineering construction standards, and product standards of URT. The terminology and classification definitions should conform to standardization rules. It is recommended to use the term ′system′ to express URT types, and the classification of systems should include basic attributes that state purpose and functionality such as target users, performance, safety requirements, and specifications, and additionally, the technical characteristics that encompass types, terminology, definitions, functions, vehicle indicators, operational characteristics, and operating environments.