Abstract: Influences of the ace-cone liner structural parameters (wall thickness, radius of curvature and cone angle) on the underwater action effect of jetting projectile charge(JPC) were studied using the LS-DYNA finite element software. The results show that the wall thickness had a great influence on the initial velocity of JPC into water, the arc radius and cone angle controlled the axial tensile and radial shrinkage of JPC, respectively, affecting the JPC morphology and mass distribution. Increasing liner thickness, and reducing arc radius and cone angle could enhance the underwater effect of JPC. The formation, velocity attenuation and damage efficiency of JPC was comprehensively analyzed, and structural parameters of the liner with better underwater operating effect of JPC were obtained, wall thickness ranged from 0.036 D_k to 0.055 D_k, the radius of curvature ranged from 0.30 D_k to 0.45 D_k, and cone angle ranged from 120° to 130°. The experiment results show that water layer thickness has a strong attenuation effect on the JPC kinetic energy. When the water layer thickness is 60 cm, JPC can penetrate the target with an average diameter of 0.54 D_k.