The　ultrafine　WC-10Co　cemented　carbide　were　prepared　by　a　new　method　that　contains　pretreatment　of　the　powder　mixture　and　subsequent　consolidation　by　spark　plasma　sintering　(SPS).　The　microstructure　and　properties　of　the　prepared　cemented　carbide　were　studied　by　scanning　microscope,　VICKERS　diamond　hardometer,　mechanical　properties　measuring　device,　etc,　and　comparing　the　results　with　that　of　vacuum　sintered　and　direct　SPSed　samples.　As　compared　with　the　vacuum　sintered　and　direct　SPSed　samples,　the　WC-10Co　cemented　carbide　prepared　by　the　direct　SPS　consolidation　method　has　finer　grains,　homogeneous　microstructure　and　higher　mechanical　properties　including　the　hardness　of　1608　HV30,　fracture　toughness　of　14.0　MPa·m1/2　and　transvere　rapture　strength　of　3100　MPa.　Mean　while,　the　effect　of　the　grain　size　matching　between　raw　WC　powder　and　Co　powder　on　the　microstructure　and　mechanical　properties　of　the　pretreated　and　then　SPSed　compact　was　also　studied,　which　shows　that　particle-size　combination　has　great　effects　on　the　microstructure　and　mechanical　properties　of　the　cemented　carbide.