Abstract: In order to solve the problems of security risks and IP address management in the terminal access of integrated network of China Railway Jinan Co. Ltd., this paper designed a system to solve the problems of IP address management and terminal access control in the integrated network from the technical and managerial level.The system could ensure that the stable operation of integrated network was not affected by IP address chaos. Through dynamic ACL centralized linkage technology, terminal installation into the network registered client, terminal access control, terminal visual, secure and credible boundary control, the problems of network boundary security were effectively solved.