Anisotropic　Nd-Fe-B　magnet　was　prepared　by　Spark　Plasma　Sintering　technique.　Magnet　with　same　composition　was　produced　using　conventional　sintering　method　for　comparison.　The　magnetic　property　before　and　after　oxidation　test　of　both　magnets　were　studied.　The　oxidation　kinetics　and　irreversible　losses　of　both　magnets　under　different　temperature　were　also　investigated　at　the　same　time.　The　microstructures　before　and　after　oxidation　test　were　observed　with　scanning　electron　microscope.　Compared　with　conventional　sintered　Nd-Fe-B　magnets,　the　SPS　magnets　process　less　reduction　of　magnetic　properties　after　high　temperature　oxidation　test.　Microstructure　observation　shows　that　SPS　magnet　has　original　microstructure,　i.e.　the　grain　size　of　the　Nd2Fe14B　main　phase　is　fine　and　uniform,　and　the　fine　Nd-rich　phase　does　not　form　along　the　grain　boundaries　of　main　phase,　but　agglomerates　into　the　triple　junctions.　Therefore,　the　pathways　for　oxidation　propagation　are　restricted　and　the　inter-granular　oxidation　process　though　Nd-rich　phase　in　the　magnet　is　suppressed　effectively.　As　a　result,　the　SPS　Nd-Fe-B　magnet　possesses　excellent　oxidation　resistance.