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With the growing popularity of intelligent terminals, as well as the increasing demand for location-based service, a design and implementation of WiFi network based mobile location service system and a location algorithm based on GMM (Gauss Mixture Model) introduced in this paper. The algorithm consists of an offline training phase and a real time localization phase, and RSSI is modeled by GMM. This system contains three parts: a server, a middleware and application client. The client is developed on Android Operation System. The server provides the underlying location service, the middleware provides user control and packaging positioning API functionalities as the bridge between the server and the clients, and the mobile clients provide location services for users directly.