In this study, the porous alumina membrane was prepared by anodic oxidation. Alumina plate was pretreated with thermal oxidation, chemical polishing and electropolishing before anodic oxidation. It was stable thermally and chemically, and pore diameter ad pore density was uniform. And the shape of pore was cyllinderical. The pore diameter, pore size distribution, pore density and thickness of membrane was changed with reaction temperature, electrolyte concentration, current density and various electrolyte(sulfuric, oxallic, phosphoric and chromic acid).