The　ultrafine　VC-10Co　cemented　carbides　were　prepared　by　spark　plasma　sintering　(SPS)　using　sub-micron　WC/nano　Co　and　sub-micron　WC/micron　Co　with　nanocrystalline　grains　as　the　raw　powders.　The　SPS　process,　microstructure　and　properties　of　the　sintered　samples　were　investigated.　The　prepared　cemented　carbides　have　all　grain　size　of　about　200　nm,　but,　the　sample　sintered　by　using　sub-micron　WC/micron　Co　powders　has　better　mechanical　properties　than　that　sintered　by　sub-inicro　WC/nano　Co　as　raw　materials,　for　example,　relative　density　of　98.0%,　hardness　of　HRA　is　94.5　and　fracture　toughness　of　13.50　MPa(.)m(1/2).　The　sintering　densification　mechanisms　were　also　analyzed　based　on　the　SPS　process.