A　new　way　of　synthesizing　pure　WC-Co　composite　powder　by　in　situ　reduction　and　carbonization　reactions　of　WO2.9,　CO3O4　and　carbon　black　powders　is　presented.　The　ultrafine-gramed　cemented　carbide　bulk　has　been　prepared　by　spark　plasma　sintering　(SPS)　the　composite　powder.　The　preparation　process,　microstructure,　and　properties　of　the　composite　powder　and　the　bulk　were　investigated　and　characterized.　Both　the　temperature　and　time　in　the　present　method　of　combing　reduction　and　carbonization　reactions　and　SPS　technique　are　apparently　reduced　as　compared　with　the　conventional　methods.　The　resultant　WC-Co　bulk　shows　a　homogeneous　fine-grain　microstructure　and　good　combined　mechanical　properties.　(c)　2007　Elsevier　B.V.　All　rights　reserved.