Abstract: In order to explore the feasibility for testing and evaluating oxidative damages in 2D C/SiC composite by thermography, the oxidative damages of 2D C/SiC samples with a blind hole without SiC coatings and three point bending 2D C/SiC samples with SiC coatings were investigated by means of thermography. The relationship between the thermography signal and the oxidative damage was analyzed, and the relationship between the thermal diffusivity and the density as well as the relationship between the thermal diffusivity and the bending strength were established. The results show that the oxidative damage can be visually recognized by thermography. The density of C/SiC logarithmically reduces with the decrease of the thermal diffusivity, and the bending strength parabolically decrease with the decrease of thermal diffusivity. The thermal diffusivity can measure the degree of oxidative damages of the ceramic matrix composite and thermography is an effective method of non-destructive testing of oxidation damage in the ceramic matrix composite.