Left　ventricular　assist　devices　(LVAD)　are　increasingly　used　for　long-term　support　in　heart　failure　patients.　To　promote　ventricular　reverse　remodeling,　a　defined　and　adjustable　energy　distribution　of　LVAD　and　native　heart　is　important.　Therefore,　a　blood　assist　index　(BAI),　which　is　a　ratio　of　power　of　LVAD　and　total　power　of　the　cardiovascular　system,　is　defined　to　indicate　the　energy　distribution　of　LVAD　and　native　heart.　Subsequently,　an　LVAD　control　algorithm　that　uses　the　BAI　as　control　input　is　designed.　The　control　strategy　maintains　the　measured　BAI　tracking　the　desired　BAI.　A　mathematic　model　of　cardiovascular　system　is　used　to　verify　the　feasibility　of　control　strategy　in　the　presence　of　left　ventricular　failure,　physical　active,　and　a　recovery　of　cardiac　function.　The　simulation　results　show　that　the　control　strategy　automatically　increases　pump　speed　in　response　to　the　reduced　peripheral　systemic　resistance　(5,500　vs.　6,000　RPM).　When　E-max　is　increased　from　0.6　to　1.8　mm　Hg/ml　to　mimic　left　ventricular　recovery,　the　blood　flow　is　automatically　increased　from　5　to　8　L/min.　As　a　key　feature,　the　proposed　control　strategy　provides　a　defined　and　adjustable　energy　distribution　of　LVAD　and　native　heart　by　regulating　the　rotational　speed　of　the　pump,　which　is　benefit　to　promote　the　left　ventricular　reverse　remodeling.　ASAIO　Journal　2011;　57:358-362.