Abstract: Public transport enterprises to establish a variety of directories suitable for their own operating line network planning and strategic development, and to formulate a selection system for various directories is an important means to improve the security of enterprise transport capacity, industrial expansion, reform and innovation. New energy city buses are key, important and heavy assets of urban public transport enterprises, improve the technical level of various assembly parts such as vehicle maintenance, safety and passenger transport, achieve the best adaptation to passenger vehicles, and dynamically grasp the latest situation of vehicles and various assembly parts industry. Ensuring the standardization, standardization and functional consistency of operating vehicles is an effective idea to achieve the enterprise management system. Guided by "technology is maintenance, adaptation is guarantee", this paper makes quantitative evaluation of different types of assembly parts by constructing the use attributes, technical indicators, assembly price evaluation, operation situation and quality assurance service level of the assembly parts, and combining with the evaluation indicators and scoring criteria of the assembly parts of new energy vehicles from four dimensions and 14 levels of enterprise industrial cooperation. Then, according to the use nature of the assembly, the assembly is comprehensively evaluated in a weighted way, so as to form the evaluation system of the assembly. No longer rely solely on the use and price to reach a conclusion, the stage score helps to adapt to the assembly problems in complex working conditions of urban public transportation in a more comprehensive way, and provides optimization and supportive suggestions for the whole life cycle management of the assembly parts of new energy vehicles. Key words: all kinds of assembly parts of new energy vehicles, selection system, adaptability