Abstract: A discrete element method (DEM) model of SiC ceramic was calibrated based on the discrete element method, the thermodynamic model of brittle materials was established, and the uniaxial compression test and three-point bending test at different temperature were carried out, the stress-strain curves, mechanical properties parameters and the failure modes during uniaxial compression tests for SiC ceramic at different temperature were also analyzed. The results show that, if the temperature was less than 500 ℃, there was a little effects on mechanical response and mechanical properties of SiC ceramic. But with the increase of temperature, the elastic modulus decreased while poisson′s ratio increased, and the compressive strength and bending strength also decreased, and the failure mode of SiC ceramic was changed from brittle fracture to plastic deformation gradually, and some softening phenomenons accompanied with the failure process.