The bubble pulse process of PETN grain and TNT spherical charge was simulated by AUTODYN .The rules of pulsation period and maximum radius which change with the mass and depth of the charge were analyzed .The results show that when the charge at a certain depth , the ratio of maximum radius and initial radius is a fixed value .It is the same for the ratio of pulsation period and initial radius .When a certain quality of TNT blasted underwater , the bubble maximum radius change exponentially with the depth of the charge and the change rules have nothing to do with the charge quality.Without considering the effect of gravity , when the charge blasts at a certain depth , with the initial radius of charge increasing multiplied , the bubble maximum radius becomes the same multiple increase .%利用AUTODYN软件模拟PETN药柱和TNT球形装药水下爆炸气泡脉动的过程，分析了脉动周期与最大半径随装药量、爆炸深度的变化规律。结果表明：当炸药所处的爆炸深度一定时，气泡膨胀最大半径与初始半径的比值、气泡脉动周期与初始半径的比值均为一个定值；一定质量的TNT装药水下爆炸时，气泡最大半径随爆炸深度呈指数形式变化且该变化规律与装药量无关；在不考虑重力的影响下，装药的爆炸深度一定时，当装药的初始半径成倍增加时，气泡脉动最大半径亦成相同倍数增加。
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