In recent years, increasing numbers of owners of urban rail transit projects recognize the value and advantages of BIM in project management, and some explorations have been made.But the BIM requirements of most projects are only based on individual technical cases, without consideration from the whole life cycle system.This paper proposes composition and construction methods of BIM implementation system of urban rail transit project based on the summary of BIM implementation experience in Beijing, Lanzhou, and Hohhot.The composition and characteristics of target system, organization system, model creation, application and management system, software and platform system and resource guarantee system are discussed respectively, and the problems in the process of implementation are also considered.The study in this paper can provide reference for BIM implementation of urban rail transit.