PURPOSE: To provide a durable hydrophilic surface in non-printing areas and enhance adhesion of a photosensitive layer to an aluminum plate, by providing a resin film on the surface of an aluminum plate or aluminum alloy plate by applying an aqueous solution containing as a main constituent an organic high- molecular weight material which shows a cationic property in aqueous solutions.

CONSTITUTION: A resin film is provided on the surface of an aluminum plate by applying an aqueous solution containing as a main constituent an organic high molecular weight material showing a cationic property in aqueous solutions, thereby producing an aluminum base for planography. The aluminum preferably has a surface previously subjected to mechanical graining, anodizing or a chemical conversion treatment to enhance adhesion of the resin film thereto. A organic high-molecular weight resin to be used as the organic high-molecular weight material comprises, as a main constituent, a high molecular weight resin having a multiplicity of amino groups (-NR2, wherein R is H, Oh or an alkyl) in the molecule thereof. Among the resins, those which give a particularly favorable result include a water-soluble polyamide resin and a cationic acrylic resin.