Ultrafine-grained　WC-Co　bulk　materials　were　prepared　by　a　new　method　that　contains　pretreatment　of　the　milled　powder　mixture　and　subsequent　spark　plasma　sintering　(SPS).　Ball　milling　parameters　and　the　pretreatment　temperature　have　significant　effects　on　the　microstructure　and　properties　of　WC-Co　cermets.　The　prepared　cermets　have　a　mean　grain　size　of　less　than　0.5　mu　m　even　with　a　pretreatment　temperature　as　high　as　1300A　degrees　C.　The　WC-10wt.%Co　cermet　bulk　prepared　by　the　optimized　milling,　pretreatment,　and　SPS　processing　achieves　excellent　mechanical　properties　with　a　Vickers　hardness　of　HV　1643,　a　fracture　toughness　of　13.1　MPa　center　dot　m(1/2)　and　a　transverse　rapture　strength　of　3100　MPa.