Computational design of the cavity in the enhanced hypervelocity launcher was carried out using Eulerian code Multi-Fluid Piecewise Parabolic Method( MFPPM). Three kinds of improved configurations of the cavity were presented with varied angles of the cavity. We numerically investigated the effects of the angle and the thickness of the TPX on the velocity,the velocity difference and the planarity of the flier. Our results show that with the given thicknesses and position of the target,the planarity and the ...