Abstract
This research seeks to improve the accuracy of calculating the collision speed of a vehicle in a car-pedestrian accident using computer simulation because most fatal accidents are pedestrian accidents. In the computer simulation, we used two different brake conditions（braking level and braking time）to investigate the relation between the distance a pedestrian is thrown and the vehicle speed upon collision. The results of our research indicated the relation formula of V＝√10X regardless of braking level in the vehicle of SUV type and if the braking is delayed （0.5sec, 1.0sec）, they indicated the relation formula of V＝√8X and V＝√6X.
