To achieve accurate landing of building information modeling(BIM) technology in the entire life cycle of rail transit projects, effectively promote the application of BIM technology in the engineering design stage, and break down the technical barriers of different operating software in various disciplines, an urban rail transit design system management mechanism integrating three elements of professional division of labor, information flow, and model delivery based on threedimensional forward design is established through data sharing and process collaboration. Then an urban rail transit design mode based on the improvement and update of design dimensions is further established, which is secondly developed by BIM software platform, realizing a threedimensional collaborative design software system. Finally, a case study is conducted on the Shenzhen Huangmugang comprehensive transportation hub, and the selfdeveloped collaborative design platform is adopted, including BIM forward design, simulation, and construction application, which provides theoretical foundation and technical practical experience for the implementation of rail transit digital construction.