Abstract: Limited by the poor GPS locating precision, it is quite difficult to implement map matching and path deriving procedures in the parallel road network by FCD (floating car data) technology, which affects the traffic information accuracy directly. On the basis of existing FCD information processing framework, some approaches were applied to improve map matching performance. And then, the freeway and service road paths were both viewed as vehicle trajectories, so as to reduce the probability of inaccurate path deriving effectively. Finally, the evidential reasoning framework was introduced to address the information unlikelihood and information conflict issues after the path selecting strategy adjustment. Contrast experiment shows that the traffic information accuracy on freeway and service road was improved about 14.26% and 9.46% respectively after employing our modified model.