BJUT-II　VAD　(Beijing　University　of　Technology　ventricular　assist　device　II)　is　a　novel　left　ventricular　assist　device.　Because　of　the　special　connection　between　the　pump　and　native　heart,　the　hemodynamic　effects　of　BJUT-II　VAD　on　coronary　artery　are　still　unclear.　Hence,　numerical　simulations　have　been　conducted　to　clarify　changes　in　hemodynamic　effects　of　different　support　modes.　A　patient-specific　left　coronary　arterial　geometric　model　is　reconstructed　based　on　the　computed　tomography　(CT)　data.　Three　support　modes,　＂constant　speed　mode,＂　＂co-pulse　mode,＂　and　＂　counter　pulse　mode,＂　are　used　in　this　study.　The　wall　shear　stress　(WSS),　wall　shear　stress　gradient　(WSSG),　cycle-averaged　wall　shear　stress　(avWSS),　oscillatory　shear　index　(OSI),　and　the　flow　pattern　are　calculated　to　evaluate　the　hemodynamic　states　of　coronary　artery.　The　computational　results　demonstrate　that　the　hemodynamic　states　of　coronary　artery　are　directly　affected　by　the　support　modes.　The　co-pulse　modes　could　achieve　the　highest　blood　perfusion　(constant　speed:　153　ml/min　vs.　co-pulse:　775　ml/min　vs.　counter　pulse:　140　ml/min)　and　the　highest　avWSS　(constant　speed:　18.1　Pa　vs.　co-pulse:　42.6　Pa　vs.　counter　pulse:　22.6　Pa).　In　addition,　both　the　WSS　and　WSSG　at　the　time　of　peak　blood　velocity　under　the　constant　speed　mode　are　lower　than　those　under　other　two　support　modes.　In　contrast,　the　counter　pulse　mode　generates　the　highest　OSI　value　(constant　speed:　0.365　vs.　co-pulse:　0.379　vs.　counter　pulse:　0.426).　BJUT-II　VAD　under　co-pulse　mode　may　have　benefits　for　improving　coronary　perfusion　and　preventing　the　development　of　atherosclerosis;　however,　the　constant　speed　mode　may　have　benefit　for　preventing　the　development　of　plaque　vulnerability.