The siphon drainage system of Beijing Daxing International Airport uses 304 stainless steel pipes and fittings. The materials have strong corrosion resistance. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids, which can effectively and normally guarantee the roof Maximum drainage life. During the construction period, the company's project team formulated different construction plans according to regional characteristics, adopted different construction methods, and completed all construction, installation and acceptance before overcoming various difficulties. Beijing New Airport has created the world's first airport terminal under high-speed rail, the world's largest airport terminal with seismic isolation bearings, the world's largest single airport terminal, the ball's first double-departure and double-decker arrival The terminal building of Taining is another national key project that Taining participated in the construction of many of the world’s best.