The design principle , system structure and functions, main technical features and its application of a vehicle monitoring system based on electronic map and GPS/GSM were introduced.Global position system (GPS), geographic information system (GIS), global system for mobile communications (GSM), the technique of computer data processing and the technique of data communication were integrated in the system .I t could realize to position satellites day and night , display electronic map , implement real-time vehicle monitoring , play back history records, send monitor and control orders and query information .The system w as able to return immediately signal of vehicle positioning and alarm information , display the run status of mobile vehicle in the form of graphic and data format, send quickly control order , watch several sites with one vehicle moving , return automatically alarm information to the control center , and so on .Experiments show that the system can accomplish intelligent vehicle monitoring , scheduler and management, and satisfy the needs of vehicle position and navigation .