Abstract: In order to solve the problems encountered by users of railway administration group company in daily use of information systems, such as unstable access, repeated login, scattered production and office matters in different application systems and low user processing efficiency, this paper designed a portal architecture of railway enterprise information system that could meet the actual demand. The architecture used OAuth2.0 to solve the problems of user single sign-on and could meet the daily production and office use of users of railway administration group company. Practice proves that the proposed architecture has certain feasibility and practicability.