Abstract: The key technology and difficult problem of radio frequency vehicle positioning system is the vehicle positioning algorithms and communication protocols,in view of the present RFID position system data collision problem,the paper makes some changes in the traditional slot algorithm,puts forward a kind of improved binary tree algorithm.The host computer software of radio frequency positioning is designed by IFIX configuration software,combined with curve fitting activex designed by VB and Matlab,the vehicle running history can be queried in the software,and the running state of the vehicle can be monitored to record the vehicle violation information and alarm in real-time.All vehicle operation information are stored in SQL database.