Demagnetization　curves　of　anisotropic　nanocomposite　MnBi/Co　and　MnBi/Fe65Co35　permanent　magnets　were　investigated　by　micro-magnetic　Finite　element　method.　Effects　of　volume　ratio,　deviation　degree　of　orientation　and　intrinsic　magnetic　properties　of　the　soft　magnetic　phase　on　the　magnetic　properties　of　the　magnets　were　investigated.　From　the　viewpoint　of　practical　applications,　to　meet　the　requirement　or　hardness　parameters,　kappa=K/(mu　M-0(s)2)(1/2)　＞　1,　the　calculation　maximum　(BH)max　of　MnBi/Co　and　MnBi/Fe65Co35　magnets　are　about　199　kJ/m(3)　(V(Co)=22　vol%)　and　196　kJ/m(3)　(V(FeCo)=14　vol%),　respectively,　indicating　their　good　potential　in　application.　Compared　with　single　phase　MnBi　magnet,　the　(BH),　of　nanocomposite　MnBi/Co　and　MnBi/Fe65Co35　magnets　increases　by　66%　and　63%,　respectively.　The　remanence　and　coercivity　of　MnBi/Co　nanocomposite　magnets　reduce　as　appearing　a　deviation　degree　of　orientation,　result　of　greatly　decrease　of　the　magnetic　energy　product.　(C)　2015　Elsevier　B.V.　All　rights　reserved.