MM33Fe66B　(MM=La,　Ce,　Pr,　Nd)　alloys　(mass　ratio)　were　prepared　by　induction　melting　and　heat-treated　at　1353　K　for　24　h　to　produce　homogeneous　MM2Fe14B　phase.　The　phase　structure　and　element　distribution　of　the　alloys　were　analyzed　by　X-ray　diffraction　(XRD)　and　scanning　electron　microscope　(SEM).　The　alloys　were　applied　ball　milling　to　obtain　powders　with　good　size　distribution　and　then　magnetic　aligned　in　a　static　magnetic　field　of　2　T　for　4　h,　in　order　to　achieve　the　intrinsic　magnetic　properties　by　vibrating　sample　magnetometer　(VSM).　XRD　results　showed　that　the　alloys　were　composed　of　the　single　2:14:1　main　phase　and　RE-rich　phase,　which　was　similar　to　Nd2Fe14B　structure.　Magnetic　measurements　showed　that　the　saturation　magnetization　(Ms)　and　anisotropy　field　(HA)　of　the　MM33Fe66B　alloy　were　11.3　kGs　and　48.4　kOe,　respectively,　demonstrating　its　good　potential　as　permanent　magnets.　The　Curie　temperature　of　the　MM33Fe66B　alloy　was　determined　as　502.9　K　by　magnetization-temperature　curves.　Microstructure　observation　showed　that　Nd　and　Pr　were　mainly　in　the　2:14:1　ferromagnetic　phase,　while　La　and　Ce　prefered　to　aggregate　in　the　RE-rich　grain　boundary　phase,　which　is　beneficial　to　fabricating　(Pr,　Nd,　MM)(2)Fe14B　magnets　with　good　magnetic　properties.