This　precise　vertical　machining　center　is　a　new　type　of　product　structure.　In　order　to　improve　the　performance　of　the　machine　tool,　two　kinds　of　bed　structural　design　schemes　are　proposed.　The　bed　structure　of　the　first　scheme　is　tilted,　and　the　second　scheme　has　a　flat　bed　structure.　The　two　kinds　of　structural　design　schemes　are　shown　in　Figure　1.　Firstly,　the　two　structures　are　analyzed　theoretically,　Then　modal　analysis　of　bed　is　carried　out　through　ANSYS　software.　At　last,　the　deformation　of　the　key　parts　under　the　external　force　was　analyzed.　Through　analysis　and　comparison,　the　optimal　scheme　of　bed　structure　was　obtained.