For reducing rocket launcher initial disturbance, based on finite element theory, use ABAQUS software to establish certain type multi-tube rocket launcher dynamic model. Through mode analysis calculation, acquire dynamic features of main component and rocket launcher. Use launch dynamic analysis to acquire related parameters of orientation tube initial disturbance, use FFT to acquire frequency which has max influence on initial disturbance. Adopt orthogonal experiment method, taking natural frequency as experiment target, to determine the component which has greatest contribution to reduce initial disturbance. The experiment results show that the model can optimize component, reduce initial disturbance and has reference value.%为减小火箭炮起始扰动，以有限元理论为基础，采用ABAQUS软件建立某多管火箭炮动力学模型。通过模态分析计算获得火箭炮各主要部件和全炮的动态特性，采用发射动力学分析得到定向管口初始扰动的相关参数，利用快速傅里叶变换得到对初始扰动影响最大的频率，并利用正交实验法，以固有频率为实验目标，确定对初始扰动贡献最大的部件。研究结果表明：该模型能有目的地优化部件，减小起始扰动，有一定的参考价值。
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