Effect　of　ion　nitriding　modification　on　surface　hardness,　corrosion　resistance　and　magnetostriction　of　(Tb0.3Dy0.7)Fe-1.95　alloy　was　investigated.　Results　demonstrated　that　a　100-200　nm　thick　nitrided　layer　was　formed　on　the　sample　surface　by　ion　nitriding　treatment,　which　improved　obviously　surface　hardness,　wear,　mid　corrosion　resistance　properties　of　(Tb0.3Dy0.7)Fe-1.95　alloys.　The　surface　hardness　was　increased　from　HV587　to　HV622　after　ion　nitriding　at　650　K　for　6　h.　Furthermore,　ion　nitriding　treatment　had　almost　no　influence　on　magnetostrictive　performance　as　the　nitrided　layer　was　quite　thin　and　the　treatment　temperature　was　not　too　high.　The　results　might　provide　us　a　new　approach　for　surface　modification　of　(Tb0.3Dy0.7)Fe-1.95　alloy.