An　an　isotropic　Nd-Fe-B　magnet　was　prepared　by　the　spark　plasma　sintering　(SPS)　technique.　A　magnet　with　the　same　composition　was　produced　using　the　conventional　sintering　method　for　comparison.　The　oxidation　behavior　in　oxidizing　environments　for　both　magnets　was　studied.　The　microstructure　and　composition　of　the　magnets　were　investigated　using　scanning　electron　microscopy　with　an　energy-dispersive　x-ray　detector.　Compared　with　the　conventional　sintered　Nd-Fe-B　magnet,　the　SPS　magnet　possesses　a　lower　oxygen　diffusion　coefficient,　which　leads　to　a　lower　oxidation　rate,　a　thinner　oxidation　layer,　and　lower　oxygen　Content.　Microstructure　observation　shows　that　the　SPS　magnet　possesses　a　unique　microstructure　due　to　the　special　sintering　mechanism.　In　detail,　the　grain　size　of　the　Nd2Fe14B　main　phase　is　fine　and　uniform.　Only　a　little　of　the　Nd-rich　phase　forms　along　the　grain　boundaries　of　the　Nd2Fe14B　phase,　while　most　of　it　agglomerates　into　triple　junctions　as　small　particles.　Therefore,　the　pathways　for　oxidation　propagation　are　restricted　and　the　intergranular　oxidation　process　through　the　Nd-rich　phase　in　the　magnet　is　suppressed　effectively.　As　a　result,　the　SPS　Nd-Fe-B　magnet:　possesses　better　oxidation　resistance　than　that　of　the　conventional　magnet.