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Nowadays, wireless network technology is booming and becoming more popular. It is convenience for people to access information from Internet. In this paper, we propose a novel model on free WLAN service. It has a high enough value to advertisers, because users are forced to view advertisements before being given access. Moreover, user's privacy is also considered. The concern of user's privacy is particularly signified in roaming network, user should keep anonymous to service provider. The free WLAN service provider can make money enough to keep and maintain free wireless service. The goal of profit-making comes from the advertisement impression will be workable in our scheme. This scheme, profit-making comes from advertisement impression by forcing user to browse advertisements before using network service, and still guarantee that user identity is anonymous, non-traceable and non-forgeable.