Spark　plasma　sintering　(SPS),　sinter-hot　isostatic　pressing　(sinter-HIP)　and　vacuum　sintering　(VS)　were　carried　out　for　densification　of　ultrafine　WC-Co　composite　powder　synthesized　by　in-situ　reduction-carbonization　reactions.　The　microstructures　and　properties　of　the　WC-Co　cemented　carbides　prepared　by　above　different　sintering　processing　were　investigated　and　compared　systematically.　The　effect　of　the　sintering　process　on　the　phases　and　properties　of　the　sintered　alloys　was　investigated.　The　results　show　that　the　main　phases　of　the　cemented　carbides　are　WC,　Co　and　a　little　η　(Co6W6C)　phase　coexisting　in　the　SPSed,　while　WC　and　Co　phases　in　the　alloys　prepared　by　sinter-HIP　and　VS.　The　present　study　also　shows　that　those　sintering　processes　can　be　used　for　preparing　cemented　tungsten　carbides　with　fine　WC　grains,　and　the　SPSed　alloy　has　the　finest　grain　size　of　0.35　μm,　the　sinter-HIPed　one　provides　excellent　properties　with　HV30　of　15121　MPa,　fracture　toughness　of　13.6　MPa·m1/2　and　TRS　of　4210　MPa.