Abstract: This paper analyzed the application status of satellite navigation system in China's railway field, combined with the technical characteristics of Beidou ground-based augmentation system, proposed the idea of construct the railway Beidou ground-based augmentation system, and further explained the system structure and composition, comprehensively analyzed the application technology of high precision Beidou satellite positioning in the railway industry, described in detail the site selection principle, steps, observation data processing and analysis method in the construction of base station of railway Beidou ground-based augmentation system. It provided a reference for future construction of base station of railway Beidou ground-based augmentation system.