Nd-Fe-B　permanent　magnets　with　a　small　amount　of　Dysprosium　(Dy)　nanoparticles　doping　were　prepared　by　conventional　sintered　method,　and　the　microstructure　and　magnetic　properties　of　the　magnets　were　studied.　Investigation　shows　that　the　coercivity　rises　gradually,　while　the　remanence　decreases　simultaneously　with　increased　Dy　doping　amount.　As　a　result,　the　magnet　with　1.5　wt.%　Dy　exhibits　optimal　magnetic　properties.　Further　investigation　presumed　that　Dy　is　enriched　as　(Nd,　Dy)(2)Fe14B　phase　in　the　surface　region　of　the　Nd2Fe14B　matrix　grains　indicated　by　the　enhancement　of　the　magneto-crystalline　anisotropy　field　of　the　Nd2Fe14B　phase.　As　a　result,　the　magnet　doped　with　a　small　amount　of　Dy　nanoparticles　possesses　remarkably　enhanced　coercivity　without　sacrificing　its　magnetization　noticeably.　(C)　2010　Elsevier　B.V.　All　rights　reserved.