Abstract: The preserving methods of industrial cail nail are presented, through mechanism studing of chemical ,and elechemical corroding to metalwork in the paper. These methods are compared and analysed. The best one of the methods is to use antirust paint, such characters of antirust paint as drying quickly, transparecy, golden colour et al are required.The relation between the painting quantity with air humidity, and the best proportion of paint, diluent, and moistureproof agent making up the antirust paint is found out.