In order to get the accurate traffic flow parameters, it often takes too long time and a lot of manpower and material resources. So, combined with GPS vehicle positioning system and the characteristics of traffic flow parameters, the transformation model of traffic parameters in intelligent acquisition system of traffic flow parameters is designed and the data processing and error recovery method are present. The results show that the system, integrated fully the advantage of GPS, can transform GPS coordinates into the features of traffic flow parameters directly, which has an intuitive guide to the traffic management department.