SmCo6.6Nb0.4　nanoflakes　with　TbCu7　structure　were　successfully　prepared　by　surfactant-assisted　high　energy　ball　milling(SA-HEBM)　with　heptane　and　oleic　acid　as　milling　medium.　The　microstructure,　crystal　structure　and　magnetic　properties　were　studied　by　scanning　electron　microscopy,　X-ray　diffraction,　and　vibrating　sample　magnetometer,　respectively.　The　effects　of　ball　milling　time　on　the　c-axis　crystallographic　alignment　and　coercivity　of　the　nanoflakes　were　systematically　investigated.　The　research　showed　that　the　nanoflakes　had　an　average　thickness　of　100　am,　an　average　diameter　of　1　mu　m,　with　an　aspect　ratio　as　high　as　100.　As　the　ball　milling　time　increased　from　2　to　8　h,　the　reflection　peaks　intensity　ratio　I-(002)/I-(101),　which　indicated　the　degree　of　c-axis　crystal　texture　of　the　SmCo6.6Nb0.4　phase,　increased　first,　reached　a　peak　at　4　h,　and　then　decreased.　Meanwhile,　the　coercivity　of　the　nanoflakes　also　increased　first,　reached　a　peak　at　13.86　kOe　for　4　h,　and　then　decreased.