描述了球形破片侵彻有限厚靶板的侵彻过程，建立了反映侵彻速度和侵彻深度间关系的分析模型．依据空穴膨胀理论计算侵彻阻力，依据Ａ－Ｂ模型将侵彻过程进行分解，并给出了各过程的侵彻方程，基于该模型研究了程序代码，以钨球对钢板、钨球对铝板分别模拟．球形破片对靶板进行了实例计算，并和试验结果进行了比较． The penetration process of spherical fragments penetrating a finite thickness target is described, and an analytical model reflecting the relationship between penetration velocity and penetration depth is established. Based on the cavity expansion theory, the penetration resistance was calculated, and the penetration process was decomposed according to the A-B model. The penetration equation of each process was given. Based on the model, the code of the program was studied. Aluminum were simulated. The spherical fragments were calculated on the target plate and compared with the experimental results.