The　penetration　ability　and　aftereffect　of　multiple　explosively　formed　projectile　(MEFP)　with　scored　liner　to　a　finite　thick　double-layer　steel　target　are　analyzed　using　ANSYS/LS-DYNA.　The　results　show　that　the　length-to-diameter　ratio　of　charge　has　little　effect　on　projectile　shape,　and　the　groove　depth　has　a　significant　effect　on　projectile　shape.　If　other　conditions　remain　unchanged,　the　increase　in　thickness　of　liner　leads　to　the　reduction　in　axial　speed　of　projectile,　increasing　the　erosion　amount　of　liner.　Therefore　the　liner　has　an　optimal　thickness　value　in　view　of　penetration　depth;　the　aftereffect　of　shallow　groove　depth　is　better.　The　simulation　results　are　consistent　with　the　experimental　results.