Water industry: The problem of water being contaminated during its storage and transportation has been paid more and more attention by people. A large number of practices have proved that stainless steel is the best material for the water industry such as preparation, storage, transportation, purification, regeneration and seawater desalination. The advantages are: corrosion resistance, earthquake resistance, water saving, hygiene (no rust and copper green), light weight (reduce 1/3), low maintenance, long life (40 years can be used), low life cycle cost (LCC) , is a green material that can be recycled and reused. According to reports, at present, the stainless steel pipeline in Tokyo, Japan has reached 76%, the pipeline leakage rate from the original 14.7% to the current 7.5%. After the earthquake in Osaka, Japan, stainless steel water tanks were intact. Recently, Japan has developed a bellows joint that reduces the construction cost of the stainless steel water transmission pipeline by 20%, the total cost by 3%, and the maintenance cost by 3/4.