从炸药装药的瞬时爆轰产物飞散理论出发，根据动量守恒原理得出药型罩装药形成爆炸成型弹丸的速度计算模型，并根据装药高度与直径之比对弹丸速度的影响修正了计算模型。应用该计算模型计算了大锥角药形罩和球缺药型罩装药形成的爆炸成型弹丸速度，计算结果与实验和数值模拟得到的结果吻合较好，此速度计算模型适合于工程应用。

From the theory of instantaneous expansion of detonation product and momentum conservation,  this paper obtains velocity calculation model of explosively formed projectile (EFP) and the model is revised due to the influence of the ratio of charge altitude to charge diameter.  This paper calculates the velocities of EFPs formed by large apex angle liner and sphere liner through the velocity calculation model and the results are consistent with the numerical simulation and experiment results.  This velocity calculation model is applicable in engineering.