Objective:　A　blood　assist　index　(BAI),　defined　as　ratio　of　the　output　power　of　LVAD　(left　ventricular　assist　device)　to　the　total　input　power　of　circulatory　system,　was　proposed　in　this　paper　to　regulate　the　energy　distribution　between　LVAD　and　natural　heart.　Methods:　A　control　strategy　based　on　model　free　adaptive　control　(MFAC)　algorithm　was　designed　by　using　BAI　as　the　control　variable.　The　algorithm　could　track　the　desired　BAI　by　regulating　the　pump　speed　to　maintain　the　measured　BAI.　A　mathematic　model　of　cardiovascular　system　was　used　to　verify　the　feasibility　of　the　controller　in　presence　of　heart　failure,　slight　physical　active　and　recovery　of　cardiac　function.　Results:　The　simulating　results　demonstrated　that　the　proposed　controller　could　automatically　regulate　the　pump　to　respond　to　the　reduced　peripheral　resistance　(5500　r/min　vs.　6000　r/min).　When　Emax　increased　from　80　to　240　Pa/mL　to　simulate　the　heart　recovery,　the　blood　flow　rate　could　increase　accordingly　from　5　to　8　L/min.　Conclusions:　The　proposed　control　strategy　can　provide　an　adjustable　and　accurate　energy　distribution　between　LVAD　and　native　heart　by　regulating　the　pump　speed,　which　would　be　of　benefit　to　promoting　left　ventricle　reverse　remodeling.