Alumina inorganic membrane is synthesized by a sol-gel process using aluminum isopropoxide as raw materials. The conditions of preparation, such as the kind and consumption of the peptizing agent, hydrolysls temperature, the amount of added water, time of refluxence, on the microstructure of alumina inorganic membrane are discussed. The results of study show that generally choose to use nitric acid as the peptizing agent, nitric acid consumption between 0.25~0.30, adds water as being 100, hydrolysis tempera...