With the popularity of mobile devices and social informatization, a lot of trajectory data is increasingly accumulated in daily life and used in different applications. Based on the location information of users in the mobile social network and campus informatization management network, a trajectory tracking system named Argo is proposed in this paper. In order to realize multi-information fusion trajectory tracking, various sources of location information such as Weibo, E-mail, BBS, E-card and the passive localization information from wireless access points covering the entire campus, are all analyzed in the Argo. Experimental results show that the system can effectively achieve the trajectory tracking and provide a better service for users.