Abstract: The railway enterprise social security information management system covers three main businesses:social insurance, enterprise annuity and supplementary medical insurance. With the in-depth promotion of the railway enterprise social security system, the characteristics of the relative independence, strong regional policy and complicated details of the data among the three major kinds of business are becoming more and more prominent.Distributed based architecture was used to take a comprehensive plan for the logical structure, network structure and data storage of the railway enterprise social security management information system. The architecture not only provides a feasible solution for storing large amounts of detailed data, improves query speed, makes all the business be in split plot design. While reducing the coupling degree, it improves the stability and adaptability of the system, and provides the possibility for the systematic step by step. The railway enterprise social security information management system has been on line and stable. The key technologies have been verified. It also provides a feasible reference solution for other system architecture planning that have complex business and a large amount of data.