As for the problem that the impact acceleration may effect submunitions’normal function,the numer-ical simulation method of submunitions’water-entry with vertical posture based on ANSYSY/LS-DYNA was put forward.This method was able to reflect submunitions’water-entry process and achieve the impact accelera-tion.The simulation result showed that,in initial period,submunitions with vertical posture would not change greatly.The peak acceleration would become greater along with the increasing of velocity,and the relationship between the peak acceleration and water-entry velocity was linear.%针对子弹入水冲击过载影响子弹正常作用的问题，提出了采用 ANSYSY/LS-DYNA 软件研究子弹垂直姿态入水冲击的数值仿真方法。该方法可以反映出子弹的入水过程，得出子弹不同入水速度的冲击过载响应值。仿真结果表明：在垂直姿态入水过程初期，子弹的入水姿态不会发生明显变化，入水冲击过载峰值与入水速度之间为线性关系，随入水速度的增大而增大。
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