Nd-Fe-B　based　permanent　magnets　were　prepared　by　both　spark　Plasma　Sintering　(SPS)　and　conventional　sintering　technique.　Mechanical　properties　and　microstructure　of　the　magnets　were　investigated.　Compared　with　conventional　sintered　magnet,　SPS　Nd-Fe-B　magnet　possesses　better　mechanical　strength　in　terms　of　both　impact　toughness　and　bending　strength,　which　have　an　increase　of　31.0%　and　44.3%　from　conventional　magnet　to　SPS　one,　respectively.　Microstructure　and　fracture　morphology　observation　shows　that　the　fracture　model　of　the　magntets　changes　from　inter-granular　fracture　of　conventional　sintered　magnet　to　intra-granular　fracture　of　SPS　magnet.　The　fine　and　uniform　Nd-Fe-B　main　phase　crystal　grains　and　even　distributed　Nd-rich　phase　are　responsible　for　the　improvement　of　mechanical　properties　of　the　SPS　Nd-Fe-B　magnet.