Abstract: The railway is a strip construction, which has the characteristics of wide range and close integration with geography. Traditional BIM software is weak in geospatial analysis, and it is difficult to support large-scale railway design, which can not solve the problem of railway project multi-professional integration in wide geographical environment. This paper discusses the usage of 3D geographic information systems as the platform to support a wide range of railway BIM applications in spatial data processing, analysis and model integration. By analyzing and researching the publishing of railway geographic information data, route design in geographical environment, seamless integration of multiple BIM models, and massive models light-weighting and displaying strategies, a complete BIM+GIS solution for railway design is proposed. On this basis, a 3D GIS-based BIM spatial information platform is constructed, which is applied and verified in the Xicheng high speed railway BIM pilot project.

Key words: building information modeling, 3D geographic information system, route design, model lightweight, spatial information system constructed