The invention relates to the intelligent on-board technical field, in particular to a system for realizing the monitoring and dispatching of vehicles by using a GPS intelligent on-board terminal; infrastructure such as a GPS global satellite positioning system, a mobile communication network and a data transmission network, etc. is used for establishing a system for dispatching, conducting and monitoring the vehicles; the invention mainly comprises a satellite positioning system, an on-board device, the mobile communication network, a network center, a data transmission network, a vehicle dispatching and monitoring management system and an electronic map; compared with the prior art, the invention adopts the GPS, GPRS, GSM, GIS and MIS techniques to realize the distribution and dispatching of tasks in enterprises and the management of vehicles; compared with the traditional semi-hand and semi-automatic management mode, the system leads the management of the enterprises to be normal and scientific, the operation process is real-time and effective, the electronic map adopts user-defined format and the data has confidentiality.