Abstract: In order to widen the application of gelcasting in porous ceramics,rheological behavior of alumina-spinel（3∶1） slurries is studied using viscometry.Naphtalene,fecula and polyvinyl alcohol were used as pore-forming additives.A series of alumina-spinel（3∶1） porous ceramics were prepared by gelcasting.After burning out sintering and measuring the porosity applying X-ray diffraction,the hightest level of porosity is found to be 52.8% and the volume density(1.84 g·cm^-3.) It is shown that the method is effective for the preparation of porous ceramics.