The BIM technology is applied in the Beijing Subway Line 7 East Extension 01 Section to assist professional works including standardization construction, technical management, safety and quality management, schedule management, cost management, construction safety risk management and steel numerical control machining. Thus, multiple collaboration management can be carried out with the help of BIM and other technologies, achieving lean construction and digital control. With the application of BIM, the information management ability has been improved effectively, with better project management ability and innovation ability, which assists the construction of "Smart Site" of the project.