the striving development of mobile business and the wide use of mobile equipment have enlightened the requirement of high efficient analyst instrument of data stream. Mobile data mining is under the environment of pervasive and finds the knowledge from the continuous data stream. We apply the mining technology of data stream to mobile environment and discuss the algorithm. And we introduce the concrete idea and steps of mobile data mining on the base of improved data stream disposing model. At last, we introduce the application instance that is the application of mobile ERP.