Structure　and　magnetic　properties　were　studied　for　bulk　nanocrystalline　Nd-Fe-B　permanent　magnets　that　were　prepared　at　650　degrees　C　for　3　min　under　300　MPa　using　the　SPS-3.20-MK-V　sintering　machine　and　the　hot　pressed　magnets　were　then　submitted　to　hot　deformation　with　height　reduction　of　50%,　60%,　70%,　80%,　and　85%.　Effects　of　height　reduction　(HR)　and　deformation　temperature　on　the　structure　and　magnetic　properties　of　the　magnets　were　investigated.　The　crystal　structure　was　evaluated　by　means　of　X-ray　diffraction　(XRD)　and　the　microstructure　was　observed　by　transmission　electron　microscopy　(TEM).　The　magnetic　properties　of　the　magnets　were　investigated　by　vibrating　sample　magnetometer　(VSM).　As　the　height　reduction　increased,　the　remanence　(B-r)　of　the　magnets　increased　first,　peaks　at　1.3　T　with　HR=60%,　then　decreased　again,　and　the　coercivity　(H-ci)　of　the　magnets　decreased　monotonically.　On　the　other　hand,　as　the　deformation　temperature　increased,　the　B-r　of　the　magnets　increased　first,　peaks　at　1.36　T　with　HR=60%,　then　decreased　again,　and　the　H-ci　of　the　magnets　decreased　monotonically.　Under　optimal　conditions,　the　hot　deformed　magnet　possessed　excellent　magnetic　properties　as　B-r=1.36　T,　H-ci=1143　kA/m,　and　(BH)(max)=370　kJ/m(3),　suggesting　the　good　potential　of　the　magnets　in　practical　applications.