With the implementation of the national South-to-North Water Diversion Project, the use of hydraulic steel structure will increase rapidly. It is very important to study and develop a new type of anti-corrosion technology of hydraulic steel structure, which will reduce the project cost and prolong the project life. To this end, the two kinds of metal coating the advantages of each complement each other, in the same workpiece substrate superimposed spray, first with zinc coating as the bottom layer, and then stainless steel coating as a surface layer, and ultimately the formation of ladder coating, applied to the water Industrial steel structure, after a lot of research and testing to obtain both economic and satisfactory anti-corrosion effect.