This paper introduces a kind of basic functions of authentication server, high concurrency authentication server has the characteristics of concurrent two-factor authentication of the client and server, epoll is adopted in the system and the thread pool technology is adopted to ensure that its high concurrency, RSA and DES algorithm is used to guarantee the security of information transmission, the server has concurrent processing ability and further improves the performance of network security authentication server. Through the complete design example test, results show that the authentication server runs normally in the case of high load operating. The system has certain practical significance to process synchronously from the client request and certification research in a short time.