The　powders　with　a　nominal　composition　of　Sm(Co0.715Fe0.20Cu0.06Zr0.025)(7.86)　are　doped　by　Sm71Cu29　powders　with　different　mass　percentages　to　prepare　magnets.　When　the　doping　amount　is　1　wt%　and　the　sintering　and　solution　temperatures　are　1215　degree　celsius　and　1175　degree　celsius,　we　obtain　a　magnet　with　the　best　overall　performance:　B-r　=　11.02　kG,　H-cj　=　36.46　kOe,　(BH)(max)　=　27.36　MGOe,　S-r　=　78.4　%.　Comparing　element　distribution　and　microstructure　of　the　undoped　magnet　with　those　of　the　1　wt%　doped　magnet,　it　is　found　that　the　doped　magnet　possesses　more　1:5　phases　with　low　domain　wall　energy,　the　Cu-lean　grain　boundaries　are　significantly　improved,　and　the　cellular　structure　is　more　uniform　and　complete.　By　doping　a　small　amount　of　powder　to　regulate　the　redistribution　of　Cu　element,　the　coercivity　of　the　magnet　is　greatly　improved,　increasing　by　140　%.　Compared　with　the　magnet　with　the　same　overall　composition,　the　element　distribution　of　the　magnet　doped　with　1　wt%　Sm71Cu29　is　more　uniform,　which　also　makes　the　performance　of　the　doped　magnet　better.