The rapid development of mobile Internet and the continuing decline of intelligent terminal cost attract more and more users,thus the user's privacy and information security becomes significant in the mobile Internet era.In this paper,we analyze the weak link in user's information security in WiFi hotspot environment,then compare the application effect of two conventional encryption algorithms,thereafter propose a secure communication based on token mechanism in OAuth protocol,which can ensure the security of user privacy,keep the server at high response speed,even can timely remind and guide the user in case of information risk or abnormality in the user's application.Finally,this design is applied in the system,and the stress test results show that the proposed design is effective.