As　the　alternative　treatment　for　heart　failure,　left　ventricular　assist　devices　(LVADs)　have　been　widely　applied　to　clinical　practice.　However,　the　effects　of　the　support　modes　of　LVADs　on　the　biomechanical　states　of　the　aortic　valve　are　still　poorly　understood.　Hence,　the　present　study　investigates　such　effects　and　proposes　a　novel　fluid-structure　interaction　(FSI)　approach　that　combines　the　lattice　Boltzmann　method　(LBM)　and　finite　element　(FE)　method.　Two　support　modes　of　LVADs,　namely　constant　speed　mode　and　constant　flow　mode,　which　have　been　widely　applied　to　clinical　practice,　are　also　designed.　Results　demonstrate　that　the　support　modes　of　LVADs　could　significantly　affect　the　biomechanical　states　of　the　aortic　valve　and　the　blood　flow　pattern　of　the　ascending　aorta.　Compared　with　those　in　the　constant　flow　mode,　the　leaflets　in　the　constant　speed　mode　could　achieve　better　dynamic　performance　and　lower　stress　during　the　systolic　phase.　The　max　radial　displacement　of　the　leaflets　in　the　constant　speed　mode　is　at　8　mm,　whereas　that　in　the　constant　flow　mode　is　at　0.8　mm.　Furthermore,　the　outflow　of　LVADs　directly　impacts　the　aortic　surfaces　of　the　leaflets　during　the　diastolic　phase　by　increasing　the　level　of　wall　shear　stress　of　the　leaflets.　The　leaflets　in　the　constant　speed　mode　receive　less　impact　than　those　in　the　constant　flow　mode.　The　condition　with　such　minimal　impact　is　conducive　to　maintaining　the　normal　structure　of　leaflets　and　benefits　the　reduction　of　the　risk　of　valvular　diseases.　In　sum,　the　support　modes　of　LVADs　exert　a　crucial　effect　on　the　biomechanical　environment　of　the　aortic　valve.　The　constant　speed　mode　is　better　than　the　constant　flow　mode　in　terms　of　providing　a　good　hemodynamic　environment　for　the　aortic　valve.