Abstract: Studies on the effects of shaped charge operating underwater are performed in simulation and experiment.Initial findings of the influence of liner parameters including the shape,thickness,radius of curvature and location of the center on shaped charge operating underwater are obtained.Both simulations of AUTODYN-2D hydrocode and experiments show that shape of the liner is the critical factor influencing the behavior of the shaped charge operating underwater.Shaped charge with the eccentric sub-hemisphere liner can produce the precursor-follower effects in water,and its armor-piercting capability after passing through the same thickness of water evidently excels either the conical or hyperbolic liner.Thickness of the liner will affect primarily the initial velocities of jetting penetrator.The curvature radius and center of liner will affect mainly the initial shape and velocity of the jetting penetrator.