As　a　new　evolutive　grain　boundary　diffusion　technology,　rotating　diffusion　technology　exhibits　many　advantages　such　as　easy　to　achieve　mass　production　and　reutilization　of　heavy　rare　earth　materials　for　diffusion.　In　this　study,　the　magnetic　properties　and　microstructure　of　sintered　Nd-Fe-B　magnets　with　enhanced　coercivity　by　rotating　diffusion　using　Dy　strips　were　studied.　The　optimal　rotating　diffusion　parameters　was　obtained　at　800　degrees　C　for　8　h,　and　the　coercivity　of　diffused　magnet　increased　from　12.51　kOe　to　17.38　kOe.　A　(Nd,Dy)(2)Fe14B　core-shell　microstructure　was　observed　in　the　surface　region　of　the　Nd2Fe14B　grains　after　the　rotating　diffusion.　In　order　to　evaluate　the　reutilization　rate　of　heavy　rare　earth　materials,　multiple　reutilization　experiments　of　Dy　strips　by　rotating　diffusion　were　implemented.　The　coercivity　enhancement　declines　slightly　with　the　increase　of　rotating　diffusion　times.　Due　to　the　evaporation　of　Dy　strips,　the　diffusion　process　results　in　uneven,　rough　surface　of　Dy　strips　with　many　small　concaves,　which　reduces　the　saturated　vapor　pressure　of　Dy　strips,　leading　to　less　Dy　evaporation　and　diffusion,　and　in　turn　to　lower　coercivity.　But　it　is　worth　to　mention　that　the　coercivity　of　the　fifth　rotating　diffusion　magnet　still　reaches　to　16.67　kOe,　which　is　33%　higher　than　that　of　the　original　magnet.　It　is　therefore　concluded　that　the　reutilization　of　Dy　strips　in　rotating　diffusion　for　sintered　Nd-Fe-B　magnets　with　enhanced　coercivity　is　feasible　and　rotating　diffusion　technology　could　realize　the　mass　production.