To study the underwater explosion shock wave attenuation of the pressure, experiments were carried out with different charge amount of grain, to obtain the underwater explosion pressure curve and the relationship between the charge volume and the peak pressure. The numerical simulation verifies the experiments. In the case of the same charge weight, the attenuation of the radial pressure of a grain of underwater explosion is obtained. The peak pressure at the explosive center is decayed with the increase of the radial distance and the curve fitting formulas are obtained.%为了研究药柱水下爆炸冲击波压力的衰减规律，通过实验研究了不同装药量微型药柱有限水域爆炸固定距离的压力曲线，得到装药量与峰值压力间的关系，通过数值模拟方式验证了实验的正确性．在同一装药量情况下研究了药柱水下爆炸径向压力的衰减规律，通过曲线拟合，得到径向峰值压力随爆心距离的衰减曲线和方程．
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