The　dense　graded　cemented　carbide　of　YG10/YG20　was　prepared　by　using　stack　moulding　and　spark　plasma　sintering　(SPS).　In　order　to　make　the　sintering　temperature　of　YG10　and　YG20　approached,　the　different　grain　size　of　WC　is　selected　and　microelement　such　as　boron　is　added　in　the　mixed　powder　YG10.　The　effect　of　sintering　temperature　on　density,　microstructure,　microhardness　and　fracture　toughness　property　were　studied.　The　component　variation　near　the　gradient　interface　and　the　variation　of　microhardness　along　the　cross-section　of　YG10/YG20　graded　cemented　carbide　were　analyzed.　The　results　show　that　the　mixed　powder　of　YG10+0.05%　with　initial　I　mu　m　WC　and　the　mixed　powder　of　YG20　with　initial　9　mu　m　WC　can　be　compacted　at　a　temperature　range　between　1100　degrees　C　to　1160　degrees　C.　The　relative　density　is　higher　than　99%　and　the　grain　size　is　homogeneous.　There　has　a　well　combine　between　the　YG10/YG20　graded　interfaces.　The　hardness　in　layer　of　YG10　is　15　500　MPa　similar　to　16　000　MPa　and　in　layer　of　YG20　is　11　100　MPa;　the　toughness　in　YG10　is　12.62　MPa(.)m(1/2)　but　there　has　no　crack　around　the　indentation　in　YG20　under　the　load　of　30　kg,　the　graded　cemented　carbide　has　high　hardness　in　one　layer　and　has　high　toughness　in　the　other　layer.