Abstract: This paper takes the ways of identification in WLAN as its object of study，on the basis of the identity of IEEE802.11i，WEP，as well as the reciprocal identification mechanism of communication entities in the security protocol design，it improves the current IEEE802.11i pseudo-two-way and makes it the real two-way authentication mechanism.The formalized simulation analysis shows that the improvements of IEEE802.11i can prevent various forged attacks so that the validation of the both sides of the communication is assured.