For studying the effects of accident reconstruction parameters on the calculated vehicle impact speed in vehicle-vehicle collision, the influencing factors in three stages of crash are analyzed, the parameter sensitivity model is built, and the effects of these parameters are analyzed through a specific accident case study. The results show that in pre-and post-impact stages, the main influencing factors are road friction coefficient and the parameters of tire model, while in impact stage the major influencing factors are impact position, impact azimuths and vehicle masses. When the angle between vehicle speeds before impact is within the range of 170° ~ 190°, the most influencing parameter is impact azimuth, and the vehicle with less mass is more sensitive to impact angle.%为研究事故再现系统参数对汽车碰撞事故车速计算值的影响,分析了车对车碰撞3个阶段的影响因素,建立了敏感性分析模型,并通过具体的事故案例分析了这些参数的影响规律.结果表明,在碰撞前后阶段,主要的影响参数是路面摩擦因数和轮胎模型参数；而在碰撞阶段,主要的影响参数是碰撞点、车辆碰撞方位角和车辆质量；当两车的碰撞夹角在170°～190°时,影响最大的参数是碰撞方位角,且质量较小的车辆对碰撞夹角更为敏感.
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