Nd-Fe-B　sintered　magnets　with　a　giant　intrinsic　coercivity　of　47.1　kOe　and　a　high　maximum　energy　product　of　38.5　MGOe　have　been　prepared　via　a　combination　of　conventional　sintering　techniques　and　novel　grain　boundary　diffusion　process.　Microstructural　observations　show　that　the　Nd(2)Fe1(4)B　main　phase　grains　in　the　magnets　exhibit　a　core/shell　type　rare-earth　elements　distribution,　where　Tb　enriched　(Nd,Tb)(2)Fe14B　phases　are　formed　in　the　surface　regions　of　the　grains.　Magnetic　domain　observations　indicate　that　these　modified　surface　regions　strongly　restrain　the　nucleation　process　of　reversed　magnetic　domains,　leading　to　a　remarkable　enhancement　of　the　coercivity　and　overall　magnetic　performance　of　the　magnets.　[GRAPHICS]　[GRAPHICS]　IMPACT　STATEMENT　Nd-Fe-B　sintered　magnets　with　an　unprecedented　overall　magnetic　property　have　been　fabricated　with　a　novel　approach,　and　the　origin　of　magnetic　property　enhancement　was　elaborated　via　magnetic　domain　observation.