Alumina porous ceramics were successfully fabricated using tabular alumina (≤0.074 and ≤0.045 mm) α -Al2O3 micropowder (d50 =2 μm),p-Al2O3 micropowder (d50 = 5 μm),and metal aluminum powder (≤0.045 mm) as the starting materials,adding different amounts of rice husk (0,5%,10%,15%, 20%,25% and 30%,by mass) as the pore-forming agent,and firing at 1 450,1 500,1 550 and 1 600 °C respectively for 3 h ... [Show full abstract] to research the effect of rice husk pore-forming agent on properties of alumina porous ceramics. The bulk density,apparent porosity,thermal conductivity and thermal-mechanical properties of fired specimens were determined. The phase composition was analyzed by XRD. The microstructure and pore structure of the fired specimens were investigated by scanning electron microscopy (SEM). The results show that the introduction of rice husk has a great influence on the pore structure,thermal conductivity and mechanical properties of the alumina porous ceramics. With the increase of the rice husk amount, the apparent porosity and average pore size of the specimens increase.whereas the thermal conductivity decreases. The residual Na2O from the ignition of rice husk and the impurities like K2O form liquid phases at high temperatures,decreasing the hot modulus of rupture and refractoriness under load obviously.