In order to correctly predict moving and borne force rule of main part of gun system, and to study parameter influence of matching evaluation of armored chassis and gun on firing process of gun system, multi-rigid-body dynamic model of gun system is established. 为正确预测火炮系统主要部件的运动和受力规律,研究车炮匹配性评价在火炮系统射击过程的参数影响,建立了火炮系统的多刚体动力学模型。