Granular　Co30Pt70/C　and　Co45Pt55/C　films,　consisting　of　nanopaxticle　CoPt　phases　embedded　in　a　carbon　matrix,　have　been　made　by　co-sputtering　from　CoPt　and　C　targets　using　a　tandem　deposition　mode.　X-ray　diffraction　shows　the　existence　of　hard　CoPt　phase　embedded　in　an　amorphous　C　matrix　after　annealing.　The　coercivities　for　CoPt/C　are　strongly　dependent　on　C　and　Pt　composition.　Films　with　coercivity　of　up　to　5.4　kOe　and　grain　size　of　7　nm　can　be　obtained.　The　development　of　shoulder　in　hysteresis　loop　may　be　contributed　to　the　co-existence　of　magnetic　Soft　COPt3　and　hard　CoPt　phases　and　the　magnetic　interactions　between　them.　High　remanence　M-T/M-8　(＞　0.8)　found　in　our　samples　indicates　the　presence　of　the　intergranular　interactions　in　the　samples.　Observed　positive　contributions　of　delta　m　also　give　evidence　of　the　existence　of　exchange　interaction.　High　coercivity　and　large　M-T/M-8　make　granular　CoPt/C　film　with　magnetic　nanoparticles　very　attractive　for　next-generation　high-density　recording.