BACKGROUND　Partial　support,　as　a　novel　support　mode,　has　been　widely　applied　in　clinical　practice　and　widely　studied.　However,　the　precise　mechanism　of　partial　support　of　LVAD　in　the　intra-ventricular　flow　pattern　is　unclear.　MATERIAL　AND　METHODS　In　this　study,　a　patient-specific　left　ventricular　geometric　model　was　reconstructed　based　on　CT　data.　The　intra-ventricular　flow　pattern　under　3　simulated　conditions　-　＂heart　failure＂,　＂partial　support＂,　and　＂full　support＂　-　were　simulated　by　using　fluid-structure　interaction　(FSI).　The　blood　flow　pattern,　wall　shear　stress　(WSS),　time-average　wall　shear　stress　(TAWSS),　oscillatory　shear　index　(OSI),　and　relative　residence　time　(RRT)　were　calculated　to　evaluate　the　hemodynamic　effects.　RESULTS　The　results　demonstrate　that　the　intra-ventricular　flow　pattern　is　significantly　changed　by　the　support　level　of　BJUT-II　VAD.　The　intra-ventricular　vortex　was　enhanced　under　partial　support　and　was　eliminated　under　full　support,　and　the　high　OSI　and　RRT　regions　changed　from　the　septum　wall　to　the　cardiac　apex.　CONCLUSIONS　In　brief,　the　support　level　of　the　BJUT-II　VAD　has　significant　effects　on　the　intra-ventricular　flow　pattern.　The　partial　support　mode　of　BJUT-II　VAD　can　enhance　the　intra-ventricular　vortex,　while　the　distribution　of　high　OSI　and　RRT　moved　from　the　septum　wall　to　the　cardiac　apex.　Hence,　the　partial　support　mode　of　BJUT-II　VAD　can　provide　more　benefit　for　intra-ventricular　flow　pattern.