Based on the finite element analysis software Ansys/LS-DYNA,the process of cutting 921A steel plate by copper linear shaped charge under four different burst height conditions was numerically simulated,in which the burst height was 0 mm,2 mm,4 mm and 6 mm,and the thickness of the steel plate was 4mm.According to the simulation results,it is concluded that 4 mm burst height is the closest to the optimal burst height,and the linear shaped charge under this working condition has the best cutting effect.The 4 mm burst height 921A steel plate shaped charge cutting experiment was carried out,and the experiment results were in high agreement with the numerical simulation results.The research results can provide reference for practical engineering problems.