Background:　Although　aortic　valve　reconstruction　has　become　an　alternative　treatment　for　aortic　valve　disease,　the　design　of　the　geometric　parameters　of　the　reconstructed　leaflet　still　mainly　depends　on　the　experience　of　doctors.　The　present　study　investigates　the　effects　of　the　height　of　the　leaflets　on　the　performance　and　biomechanical　states　of　the　reconstructed　aortic　valve.　Methods:　This　numerical　study　was　carried　out　using　the　finite　element　approach　and　the　lattice　Boltzmann　method.　The　dynamic　and　biomechanical　characteristics　of　the　leaflets　were　evaluated　by　using　the　finite　element　approach,　while　the　blood　flow　in　the　aortic　sinus　was　evaluated　by　applying　the　lattice　Boltzmann　method.　Three　types　of　leaflets　with　different　heights　were　designed.　Then　the　dynamic　characteristics,　stress　distribution,　and　effective　orifice　area　(EOA)　of　the　aortic　valve　and　flow　pattern　were　calculated　as　the　indicators.　Results:　The　results　demonstrated　that　the　height　of　the　leaflets　could　indeed　regulate　the　performance　and　the　biomechanical　states　of　the　aortic　valve.　The　rapid　valve　opening　times　of　the　3　types　of　leaflets　gradually　reduced　along　with　the　decrease　of　the　height　ratio　(HR_0.8:　120　ms　vs.　HR_1.0:　68　ms　vs.　HR_1.2:　31　ms),　while　the　rapid　valve　closing　times　(RVCTs)　of　the　3　types　of　leaflets　were　similar　to　each　other　(approximately　75　ms).　Moreover,　the　radial　displacement　of　the　leaflet　at　the　fully　open　time　increased　along　with　the　decrease　of　the　HR　of　the　leaflets　(HR_0.8:　8　mm　vs.　HR_1.0:　6　mm　vs.　HR_1.2:　4　mm).　In　addition,　the　stress　level　of　the　leaflets　also　increased　with　the　increase　of　the　height　of　the　leaflets　(max　stress,　HR_0.8:　0.5　MPa,　vs.　HR_1.0:　1.1　MPa,　vs.　HR_1.2:　1.8　MPa).　Similarly,　the　low　velocity　region　near　the　ascending　aortic　wall　and　the　wall　shear　stress　(WSS)　level　on　the　ventricular　side　of　the　leaflets　also　increased　along　with　the　increase　of　the　HR　of　the　leaflets.　Conclusions:　In　short,　the　height　of　the　leaflets　mainly　affects　the　opening　performance　of　the　reconstructed　aortic　leaflets.　The　HR　of　the　reconstructed　leaflets　for　adults　should　be　less　than　1.0　to　balance　the　opening　and　closing　performance　of　aortic　leaflets.