Nd-Fe-B　permanent　magnets　doped　with　a　small　amount　of　praseodymium　(Pr)　nanoparticles　were　prepared　by　conventional　sintering　method.　Effects　of　the　Pr　nanoparticles　doping　amount　and　the　sintering　temperature　on　the　magnetic　properties　of　the　magnets　were　studied.　As　the　doping　amount　increases,　the　coercivity　of　the　magnets　rises　gradually,　while　the　remanence　and　the　maximum　energy　product　of　the　magnets　rise　first,　peak　at　1.0　wt.　%　of　Pr　nanoparticles　doping,　then　drop.　The　optimal　sintering　temperature　was　determined　as　1040　degrees　C.　Under　optimal　doping　amount　and　sintering　temperature,　the　Nd-Fe-B　magnet　bears　good　magnetic　properties　of　B(r)　of　1.386　T,　H(ci)　of　1170　kA/m　and　(BH)(max)　of　371　kJ/m(3),　which　are　better　than　the　Pr-free　magnet＇s　magnetic　properties　of　B(r)　of　1.358　T,　H(ci)　of　1097　kA/m　and　(BH)(max)　of　354　kJ/m(3),　suggesting　the　doping　of　Pr　nanoparticles　is　a　promising　way　to　enhance　the　magnetic　properties　of　sintered　Nd-Fe-B　magnets.　(c)　2011　American　Institute　of　Physics.　[doi:10.1063/1.3565415]