Abstract: This paper studied on the SOA modeling principle, combined with the actual development and application of integration platform of railway passenger services system, used the SOA modeling method, developed the SOA based service middleware to integration platform of railway passenger services system, which improved the business performance of stability and scalability for passenger services system, provided a strong technical basis for the future development of the railway passenger services system. Recently, the service middleware has been used in Kunming-Shanghai Line, Yunnan-Guangxi Lne, Hohhot-Zhangjiakou Line, and got good application effect.