为给仿真车－人碰撞事故提供可靠的事故车辆车速近似值，基于经典力学理论及若干假设，推导出行人第一落地点抛距与事故车辆车速的关系，并据此获得了两个有价值的预估事故车辆最小车速模型:其一用于平坦路面，其二则用于有坡度路面． 然后借助已有研究成果及 Pc-Crash 仿真试验数据，对所得模型进行了验证，结果表明，所得模型有效、可行． 最后，通过给出的一例真实车－人碰撞事故案例，演示并进一步验证了所得模型．

In order to provide a reliable approximate vehicle velocityd for simulating a vehicle-pedestrian accident,the relationship between the flight-phase distance of pedestrian and the vehicle velocity is derived,based on theclassical mechanics and some hypotheses.Then,two useful prediction models of minimal vehicle velocity are ob-tained,and one of them is used for a flat road while the other is used for a slope.Moreover,the two models are ver-ified by comparing the existing researches with the simulation results obtained through Pc-Crash.It is found that thetwo models are effective and feasible.Finally,the two models are further verified by a real vehicle-pedestrian acci-dent.