In order to enhance the interference effect of the linear explosively formed projectile on the armor-piercing projectile, and thereby enhance the armor protection effect, ANSYS/LS-DYNA software is used to interfere with a combined linear explosively formed penetrating body to interfere with the rod-type armor-piercing projectile and the interfered armor-piercing projectile to penetrate the after-effect target numerical simulation of the process of the plate was carried out. Under the condition of changing only one parameter, copper was used as the material of the charge, and the effect of the wall thickness, radius of curvature and charge height of the charge on the combined LEFP jamming rod armor-piercing projectile was mainly analyzed. The results show that the wall thickness of the drug type cover is 0.06D~0.1D(D is the width of the charge) for the best interference effect; when the wall thickness of the drug type cover is 0.06D and the radius of curvature is 0.9D~1.2D, the interference effect of LEFP increases with the increase of the radius of curvature. Increase the comparison of the interference effects at different charge heights shows that the charge height is 0.9D, and the combined LEFP has the best shape and interference effect on armor-piercing projectiles, which provides a reference for the research of new anti-missile weapons.