During the automobile braking ,in view of the effect factors of braking distance of traffic accident , some study which is contacted with automobile braking original speed in the traffic accident have been done .By an-alyzing the deficiency of the traditional calculation method and theoretical knowledge , there is a simulation being made by vehicle dynamics simulation software CarSim .And by using Matlab , which can be used to do data-fitting, a maximum braking acceleration duration as the independent variable of the formula is came up with .Results of tri-al indicated that the braking original speed which is calculated by the formula in the traffic accident agrees well with that of testing .%基于汽车制动过程分析，结合实际交通事故中制动距离的影响因素，针对交通事故中汽车制动初速度计算方法进行了研究，通过分析传统计算的不足。结合理论知识，采用车辆动力学仿真软件CarSim中的实车仿真模块进行仿真分析，将最大制动加速度持续时间与制动初速度采用Matlab拟合，得到了一种以最大制动加速度持续时间为自变量的计算公式。最后进行实车试验采集制动数据，试验结果表明，该公式在交通事故中计算出的制动初速度，与实际情况基本吻合。
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