To control the influence of selected parameter errors on calculation results of vehicle collision models based on momentum theorem, a sensitivity analysis method of selected parameters is proposed by applying matrix theory on the base of influence mechanism analysis. According to the common errors pattern of selected parameters , both indicators for analysis and evaluation of parameter sensitivity conforming to real working conditions are established and then used to study the sensitivity of selected parameters for a real typical vehicle collision case. The results show that when the relative calculation error is less than or equal to 5% , the maximum error range of selected parameters is ?6. 12% and the reasonable range of selected parameters is determined accordingly. The range of selected parameters determined this way can assure accident analysis results meeting the requirements of control condition.%为控制基于动量定理的汽车碰撞模型中自选参数误差对计算结果的影响,在影响机理分析的基础上,应用矩阵理论提出了一种自选参数敏感性分析方法.针对自选参数常见的误差形式,建立了符合实际工况的参数敏感性分析和评价指标.应用分析和评价指标对一起典型汽车碰撞实例的自选参数敏感性进行了研究.实例计算结果表明,以相对计算误差≤5％作为控制条件,自选参数最大误差范围为±16.12％,并依此确定了自选参数的合理范围；应用该方法确定的自选参数范围能保证事故分析结果满足控制条件的要求.
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