A　new　type　of　NdFeB　magnets　with　high　magnetic　properties　was　prepared　by　spark　plasma　sintering　(SPS)　technique.　Effects　of　the　heat　treatment　conditions　on　microstructure,　magnetic　properties　and　metallurgical　transformations　of　magnets　were　systematically　studied,　by　means　of　SEM,　B-H　loop-line　instrument,　and　XRD,　respectively.　It　is　found　that　the　SPS　NdFeB　magnets　sintered　at　different　temperatures　during　heat　treatment　exhibit　the　same　regularity　and　there　exists　an　optimum　temperature　of　1050°C.　The　coercivity　of　SPS　NdFeB　magnets　increases,　owing　to　the　changing　of　structure　and　composition　of　Nd-rich　phase　during　heat　treatment.　Under　optimum　processing　conditions,　the　SPS　NdFeB　magnet　possesses　the　best　magnetic　properties　with　a　remanence　of　1.351　T,　a　coercive　force　of　674.4　kA　·　m-1,　and　a　maximum　energy　production　of　360.4　kJ　·　m-3.