Abstract: Positioning and navigation in deep-buried complex station often face problems like lacking positioning service coverage, dealing with high traveler flow and complex indoor structure. This paper took the multi-storey space of a deep-buried complex station of Beijing-Zhangjiakou high-speed railway as the object to build an intelligent navigation system. According to the navigation requirements, the paper carried out the format conversion and information reading of the station Building Information Modeling(BIM), and imported it into Unity3D, and used Navigation Mesh(NavMesh) to quickly generate a navigable map, used computer vision technology to implement real-time positioning in the absence of Global Positioning System(GPS) signal, and provided users with efficient and accurate augmented reality intelligent navigation service, solved the problem of inaccurate and discontinuous positioning in cross layer navigation. According to the needs of users, the paper set up different functional modules to help users quickly find the corresponding destination and implement the efficient and convenient travel for passengers.