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To guarantee the safety of public transport and effectiveness in dispatching buses, overall solution on Beijing bus monitoring system (BJ-BMS) based on GPS is put forward in this paper. The system is composed of communication control and GIS subsystems, each of which was independently developed in the beginning and integrated in the end. The key technologies of the system are described in detail. In addition to some fundamental functions such as real-time monitoring, some featured functions tightly combined with the daily operations in Beijing Bus Company are realized in the BJ-BMS. Finally, the status of system implementation and maintenance are introduced, which have proven to be very effective in practical applications during 2008 Beijing Olympics.