Nd2Fe14B/alpha-Fe　isotropic　bulk　nanocomposite　magnets　were　prepared　by　spark　plasma　sintering　(SPS)　technique　using　melt-spun　powders　with　a　nominated　composition　of　NdxFe94-xB6,　with　x=6,　8,　and　10.　It　was　found　that　higher　sintering　temperature　improved　the　densification　of　the　magnets,　while　it　deteriorated　their　magnetic　properties　simultaneously　due　to　the　excess　crystal　grain　growth.　An　increased　compressive　pressure　led　to　better　magnetic　properties　and　higher　density　for　the　SPS　magnets.　An　increase　in　the　Nd　amount　resulted　in　a　gradual　increase　in　intrinsic　coercivity　and　an　obvious　reduction　of　the　remanence　of　the　magnets　simultaneously.　A　magnet　with　the　composition　of　Nd8Fe86B6　possessed　a　B-r　of　0.99　T,　a　H-ci　of　386　kA/m,　and　a　(BH)(max)　of　101　kJ/m(3)　under　the　optimal　sintering　condition.　In　addition,　microstructure　observation　using　transmission　electron　microscopy　showed　that　compared　with　the　starting　powders　the　full-density　magnets　nearly　maintain　the　morphology,　indicating　that　there　was　no　sign　of　pronounced　crystal　grain　growth　during　the　densification　process.　(C)　2006　American　Institute　of　Physics.