Patients　with　aortic　valve　disease　can　suffer　from　valve　insufficiency　after　valve　repair　surgery　due　to　aortic　root　dilatation.　The　paper　investigates　the　effect　of　valve　height　(Hv)　on　the　aortic　valve　opening　and　closing　in　order　to　select　the　appropriate　range　of　Hv　for　smoother　blood　flow　through　the　aortic　valve　and　valve　closure　completely　in　the　case　of　continuous　aortic　root　dilatation.　A　total　of　20　parameterized　three-dimensional　models　of　the　aortic　root　were　constructed　following　clinical　surgical　guidance.　Aortic　annulus　diameter　(DAA)　was　separately　set　to　26,　27,　28,　29,　and　30　mm　to　simulate　aortic　root　dilatation.　H-V　value　was　separately　set　to　13.5,　14,　14.5,　and　15　mm　to　simulate　aortic　valve　alterations　in　surgery.　Time-varying　pressure　loads　were　applied　to　the　valve,　vessel　wall　of　the　ascending　aorta,　and　left　ventricle.　Then,　finite　element　analysis　software　was　employed　to　simulate　the　movement　and　mechanics　of　the　aortic　root.　The　feasible　design　range　of　the　valve　size　was　evaluated　using　maximum　stress,　geometric　orifice　area　(GOA),　and　leaflet　contact　force.　The　results　show　that　the　valve　was　incompletely　closed　when　H-V　was　13.5　mm　and　D-AA　was　29　or　30　mm.　The　GOA　of　the　valve　was　small　when　H-V　was　15　mm　and　D-AA　was　26　or　27　mm.　The　corresponding　values　of　the　other　models　were　within　the　normal　range.　Compared　with　the　model　with　an　H-V　of　14　mm,　the　model　with　an　H-V　of　14.5　mm　could　effectively　reduce　maximum　stress　and　had　relatively　larger　GOA　and　less　change　in　contact　force.　As　a　result,　valve　height　affects　the　performance　of　aortic　valve　opening　and　closing.　Smaller　H-V　is　adapted　to　smaller　D-AA　and　vice　versa.　When　H-V　is　14.5　mm,　the　valve　is　well　adapted　to　the　dilatation　of　the　aortic　root　to　enhance　repair　durability.　Therefore,　more　attention　should　be　paid　to　H-V　in　surgical　planning.