The　ultrafine　WC-10Co　cemented　carbides　were　prepared　by　high-energy　ball　milling　and　spark　plasma　sintering　(SPS)　using　submicron　WC/micron　Co　as　the　raw　powder.　The　SPS　process,　microstructure　and　properties　of　the　sintered　samples　were　investigated.　The　sample　sintered　at　1200°C　has　better　mechanical　properties　than　that　sintered　at　1150°C,　such　as　relative　density　of　98.6%,　hardness　of　94.0　HRA,　transverse　rupture　strength　(TRS)　of　1819　MPa.　The　composite　was　pretreated　before　sintered,　and　the　sample　has　better　mechanical　properties　than　the　samples　sintered　with　no　pretreated　composite,　for　example,　relative　density　of　99.1%,　TRS　of　1937　MPa,　sintered　at　1150°C.