The　Nd-substituted　(NdxMM1-x)-Fe-B　strip-casting　flakes　were　prepared　by　induction　melting　in　the　vacuum　furnace　and　then　subsequently　by　strip-casting　technology.　The　microstructure　and　magnetic　properties　of　(NdxMM1-x)-Fe-B　alloys　are　related　to　the　Nd　substitution.　2:14:1　main　phases　and　minor　impure　phases　coexist　in　the　MM-Fe-B　flake.　For　example,　La2O3　and　CeFe2　impure　phases　are　obviously　detected　in　the　x　=　0　specimen.　As　an　increase　of　the　Ce　concentration　is　inversely　accompanied　with　the　decrease　of　the　Nd　content　(x)　in　(NdxMM1-x)(2)Fe14B　main　phases　(0　＜=　x　＜=　1),　XRD　analysis　shows　that　the　overall　diffraction　peaks　of　the　main　phases　shift　to　right　domestically　because　of　smaller　radius　Ce4+.　The　melting　point,　spin　reorientation　phase　transition　temperature,　Curie　temperature,　magneto-crystalline　anisotropy　field　(at　300　K),　and　the　magnetization　(M-9T)　for　MM-Fe-B/(Nd0.4MM0.6)-Fe-B/(Nd0.7MM0.3)-Fe-B/Nd-Fe-B　strip-casting　alloys　are　1376.15/1414.15/1439.15/1458.15　K,　74/113/124/135　K,　493.2/538.4/559.7/582.3　K,　48/55.2/64.4/70.1　kOe　and　136.5/143.7/151.5/153.7　emu/g,　respectively.　Due　to　the　varied　composition　of　hard　magnetic　main　phases,　M-9T　increases　gradually　with　the　increase　of　Nd　content　(x).　SEM　observation　and　EDX　results　demonstrate　that　more　Nd　and　Pr　elements　aggregate　into　the　2:14:1　ferromagnetic　phase,　while　less　La　and　Ce　elements　are　prone　to　the　RE-rich　region　compared　with　the　nominal　ratio.　As　a　result,　the　growth　of　M-9T　becomes　extraordinary　under　maximum　external　field　9　T,　indicating　that　the　(Nd0.7MM0.3)-Fe-B　flake　may　display　relatively　good　magnetic　properties　and　those　with　higher　Nd　content　have　evident　effect　on　magnetization,　compositions,　and　microstructures　of　hard　magnetic　main　phases.　Therefore,　practical　application　of　(NdxMM1-x)-Fe-B-sintered　magnets　will　be　very　prospective.