本文针对自动武器中药筒和身管变形的变间隙、变锥度的特点，构造了身管和药筒的截面环等参元分析模型，并据此建立了相应的增量形式的弹塑性有限元求解方程．针对贴膛不同时刻的特点，在身管和药筒上配置了配点对，应用变形协调条件，编制了药筒和身管高压间隙变形的有限元求解程序．并给出了数值计算实例． In this paper, according to the characteristics of variable clearance and taper of the cartridge and barrel deformation in the automatic weapon, the isoparametric analysis model of the cross-section ring of the barrel and the cartridge is constructed. Corresponding incremental elasto-plastic finite element Solve the equation. In view of the different characteristics of the muffler at different times, the matching pairs were arranged on the barrel and the barrel, and the deformation and coordination conditions were applied to prepare the finite element solving program of the barrel and barrel high pressure gap deformation. A numerical example is given.