Abstract: Paving the train flow diagram is an important process for optimizing railway transportation planning and organization. In order to improve the compilation efficiency of train flow diagram in railway design, this paper used Spring Boot framework, Vue framework and Java, designed and implemented a train flow diagram compilation system based on B/S architecture. The system provided wagon flow calculation, train flow calculation, index statistics, train flow diagram compilation and drawing functions, had a high level of intelligence. It is convenient and quick to prepare and adjust the train flow diagram, which helps to reduce the work intensity of railway designers and improve the quality of automatic train flow diagram compilation.