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Due to amazing development of network technology and increasing prevalence of network application, network is bound to penetrate into various arenas of social life. Naturally, as a significant infrastructure in colleges and universities, CAN is supposed to develop with high speed for the purpose of innovating education, elevating system of administration and teaching quality. However, security of application and administration of CAN has to face extreme challenge. Thus it has become an intractable problem for administrator of CAN how to establish sophisticated secure system of CAN. Having taken analysis on current security problems prevalent over CAN, the paper takes tentative research on dynamic, all-round and active secure system of network, which is circled by secure strategy, guaranteed by secure technology, controlled by secure administration as well as brings forward specific solving proposal.