As sintering temperature increased from 1350 ฐC to 1500 ฐC, compressive strength of sintered samples increased from 3.05 to 11.68 MPa, and a remarkable increase was observed from 1400 to 1450 ฐC. With sintering temperature increasing, mullite particles connected closer and linear shrinkage became larger. Thus the structure of sintered samples became stronger, which led to higher compressive strength. Thermal conductivity of sintered porous mullite/corundum ceramics increased from0.14 to 0.35 W/(mทK) with sintering temperature increasing from 1350 to 1550 ฐC. As known, thermal conductivity decreases with increasing of porosity for materials with same phase.