本文分析了低温感包覆火药装药在火炮膛内点传火和燃烧的物理过程，建立了具有主装药、包覆药、可燃药筒、中心传火管和尾翼管状药等五种装药原件这一复杂装药结构的两相流内弹道物理模型和数学模型，编写了相应的计算程序，并以某线膛炮为例进行了计算，结果表明：计算值与实验值吻合较好。 In this paper, the physical process of ignition and burning of gunpowder at low temperature is analyzed. Five kinds of equipment, including main charge, coating drug, combustible cartridge, central transmission tube and tail tubular drug, are established The original physical model and mathematical model of two-phase internal flow trajectory of the complex drug charge were prepared. Corresponding calculation programs were prepared and the calculation was made with a rifled gun as an example. The results show that the calculated values ​​are in good agreement with the experimental values.