Modeling　of　the　large　diameter　Fresnel　lens　mold　machine　tool　bed　using　3D　software　solid　works,　and　then　import　the　ANSYS　Workbench,　natural　frequencies　and　modal　shapes　are　obtained　by　the　study　of　the　modal　analysis　and　analysis　of　the　structure　characteristics　of　the　machine　bed,　for　the　next　step　on　the　bed　structure　optimized　to　provide　a　reliable　theoretical　basis.　©　(2014)　Trans　Tech　Publications,　Switzerland.