Abstract: This article combined with the pilot project of Lunan Railway, explored the process of track design based on Bentley platform. The article expounded the general situation of Lunan Railway project, chose the platform according to the characteristics of the project, and made a brief analysis, put forward the design process consisting of four parts:source document, component library, track design and application. The application of Bentley platform in the pilot project of Lunan railway has verified the feasibility of Bentley platform and software in track specialty. The conception of track BIM design system was put forward to provide reference for implementing the forward design of track BIM.