With perfect characteristic of designability, easy to forming, convenience maintenance, compare with steel, FRP(fiberglass reinforced plastic) has a very high corrosion resistance and has a specific gravity of 1.5 to 1.9, far lower than 7.8 of steel, but it mechanical strength is higher than steel’s , and it also has the advantage of low coefficient of thermal expansion and perfect thermal insulation, FRP vessels are widely used in many fields.