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Aim to the security problems that vehicle be stolen or unauthorized drive and the phenomenon that utility vehicle used by private, the vehicle tracing and positioning system based on GPS technology is proposed, which implement the functions such as trace report and anti-theft. Under the Linux environment, a simple vehicle positioning system is developed by C Language. In which, the GPS module is adopted to gather the vehicle longitude, latitude, elevation and running speed, etc. The process functions for vehicle positioning information such as record, output, lock and print are implement. The data for vehicle monitoring may be uploaded to website by TCP protocol, so that viewer may view the vehicle running condition clearly. An interface is designed by QT to output positioning information and filter the information according to the certain time condition.