Abstract: Taking the front square project of Xinglong West Railway Station as an example, this paper introduces how to use BIM technology to reasonably solve the problem of construction of mountain foundation and cross-gully structure from four aspects: engineering overview, topographic BIM application, BIM comprehensive application and smart construction site application. The project is led by the company BIM, and the application of mountain BIM technology is the core to realize multi-dimensional BIM application. Taking construction demand as the main line, the software application system is determined according to BIM modeling, construction progress simulation, construction process simulation, safety submission, simulation experience and other requirements, so as to realize the integration and application of topographic BIM data. Taking software requirements as the main line, hardware equipment is determined according to specific BIM technical route. In view of the characteristics of project construction, BIM+intelligent site is taken as the main line, and BIM application objectives are formulated from the key and difficult points of topography and gully geology.