In modern society, more and more companies have introduced different systems in corporate business sectors, furthermore, an employee may work in various systems. As a result, the employees need to record multiple usernames and passwords, which brings discomfort and lots of likelihood of errors, and posts security risks for the different systems that have their own security user authentications. Meanwhile, most of management systems are based on B/S model, where one of the foremost requirements is to provide low-latency access to frequent and large amounts of requests. To address this needs, in this paper, we firstly demonstrate the design of a web unified user management system which based on the Role-based access control (RBAC) model and Memcached. Secondly we conducted an experiment on two groups of integrated prototype systems to validate our results. Finally we draw a conclusion than it can not only monitor users in real time and configure the permissions safely and flexibly, but also reduce the response time significantly and improve the system performance.