Abstract: Distributed architecture was used and multiple heterogeneous systems was integrated in the railway enterprise’s social security management information system. In order to ensure the security and ease to be used for the system, it was necessary to introduce the unified identity authentication. Based on the technology of single sign-on, session sharing and NOSQL, this paper put forward the overall design idea and function design of the unified identity authentication platform with multi-technology integration, and gave the specific implementation path of the platform. It could not only solve the problem of identity authentication for railway enterprise’s social security management information system, but also provided a feasible solution for unified identity authentication of distributed system.