Microstructure　evolution　and　plastic　deformation　mechanisms　of　the　ultra-coarse　cemented　carbide　compressed　at　different　temperatures　were　studied　based　on　designed　experiments　and　a　proposed　energy　model.　The　cemented　carbide　compressed　at　high　temperature　exhibited　larger　strain,　which　resulted　from　the　generation　and　movement　of　high　density　of　dislocations　in　WC　grain.　The　energies　stored　in　WC　and　Co　phases　and　dissipated　by　heat　energy　in　the　deformation　were　quantified.　The　larger　energy　stored　in　WC　grain　than　that　in　Co　phase　indicates　significant　contribution　of　the　hard　matrix　to　deformation　of　the　ultra-coarse　cemented　carbide.