TbCu7-type　SmCo7-based　permanent　magnets　possess　great　potential　for　applications　in　high-temperature　service　because　of　their　large　magnetocrystalline　anisotropy　and　low　temperature　coefficient　of　coercivity.　However,　the　application　of　SmCo7-based　alloys　is　seriously　limited　by　the　trade-off　between　the　TbCu7-type　phase　stability　and　the　intrinsic　magnetic　properties,　as　well　as　the　balance　between　the　saturation　magnetization　and　the　coercivity.　In　this　study,　a　series　of　SmCo7-based　nanocrystalline　alloys　doped　by　Mn,　Cu,　and　Fe　elements　were　prepared.　The　TbCu7-type　phase　was　well　stabilized　by　nanostructuring　and　appropriate　doping.　Tailoring　the　element　doping　enhanced　the　coercivity　by　50　%　and　achieved　a　balance　between　the　saturation　magnetization　and　the　coercivity　of　the　SmCo7-based　nanocrystalline　alloys.　The　mechanisms　of　the　magnetic　properties　enhancement　were　disclosed　based　on　the　characterization　of　microstructures　and　magnetic　structures.　It　is　proposed　that　a　high　proportion　of　the　TbCu7-type　SmCo7　main　phase　is　critical　to　achieve　excellent　magnetic　properties.　This　study　provides　both　the　method　and　rules　for　the　development　of　multi-component　Sm-Co-based　alloys　with　high　integrated　magnetic　properties.