Abstract: According to portable communication terminal has limited computation resource and communication ability.Which is difficult to implement key cryptography algorithm with large amount of calculation question.It is proposed an authentication method based on EAP-SAKE in order to solve the problem.It uses some security technologies to provide mutual authentication between peers,such as message integrity code,etc.This authentication method generates different keys for various purposes from root secret and constitutes key hierarchy.In addition,it can resist replay attack and man-in-middle attack.It has less communication load and computing amount and provides key negotiation.So it is more suitable for protecting the information security in mobile terminal which has limited resource in WLAN.