Abstract: With the rapid development of China's modern comprehensive transportation system, the people's demand for travel quality continues increases, and there is an urgent need to build a passenger centered intermodal transportation service model. For this purpose, this paper designed the architecture of integrated intelligent travel service platform for railway passenger intermodal transportation (R-MaaS). The paper provided a detailed introduction to the design requirements, functions, key technologies, implementation effects of this architecture, as well as the integrated intelligent travel service system formed based on this architecture. The construction of the platform architecture has strongly supported the air-rail intermodal transport, rail-water intermodal transport, tourism tickets and other services based on the railway 12306 Internet ticketing system, enriched the supply of passenger intermodal transport products, improved the service quality, and has a positive significance in promoting the innovation of passenger intermodal transport mechanism.