Navigation and power junction projects generally have the characteristics such as large project investment，long construction period，complex construction environment and difficult coordination. Under the traditional management mode，the project is difficult to achieve refined management，there are a series of problems in the construction process，such as poor information communication and personnel coordination，difficulty in engineering measurement visa and schedule control. We analyze the application of BIM technology in design optimization and management in Qianwei navigation-power junction，and explore the refined management mode based on BIM technology. The results show that through the application of BIM technology during a total of life cycle in Qianwei navigation-power junction，it improves the design quality in the survey and design stage，realizes the auxiliary project management in all aspects of quality，progress，cost and safety in the construction stage，and finally realizes the cost reduction and efficiency increase of the project.