In view of the current problems existing in the vehicle-mounted anti-theft devices and the market application prospect, a new embedded vehicle-mounted anti-theft system is presented. Firstly, the hardware platform is set up by a S3C2410X as a microprocessor core, a GPRS module and a GPS module. And then, the software designs of the system, the GPS and the GPRS are introduced in detail. As the experiments show, the system is stable, reliable and efficient in communication. The researches can be referred in further studies on the embedded anti-theft system.