Heat conduction behavior of Al2O3-Cr3C2 composite with Cr3C2 content varying from 0 to 40% in volume were investigated using a laser-flash method. Thermal diffusivity of the composite decreased sharply as first incorporating 10 vol.% of Cr3C2, then increased with further increase of Cr3C2 content up to 40 vol.%. Similar trends were observed for thermal conductivity behaviour. The significantly decreased thermal diffusivity as well as thermal conductivity at lower content of Cr3C2 was assumed to be ascribed mainly to the formation of "composite grain" wherein the fine Cr3C2 particle being trapped into Al2O3 grain. Furthermore, the formation of an amorphous layer with thickness approx. 10 Å at inclusion/matrix interface may also act as a barrier to phonon conduction.