Abstract: In order to improve the systematic, standardized, multi-disciplinary, and multi scenario comprehensive application level of real scene 3D technology in railway engineering, this paper combined the overall framework of real scene 3D construction in China and the needs of digital railway construction to study the construction technology of real scene 3D railway. It proposed the composition of real scene 3D railway and the production methods of basic data such as geographic scenes, geographic entities, and railway entities, and elaborated on the database design, database management, and application service platform construction methods of real scene 3D railway, implemented unified organization and management of massive spatial data sources, 3D scene construction, spatial analysis applications, and online data services. This study provides an integrated 3D digital scene for railway engineering management, which can meet the application needs of survey and design, construction and operation maintenance stages, and enhance the digitalization and intelligence level of railway engineering construction management.