Air separation plant industry is closely related to steel, metallurgy, chemical industry and other industries, and its development trend is also affected by the needs and policies of these industries. These enterprises have higher and higher requirements on the technology, energy consumption, reliability and delivery cycle of air separation plant, so it is not enough to meet the oxygen demand of enterprises. DEAR air separation is developing from the manufacturer of air separation plant industry to the supplier of gas products. The manufacturing and sales business of gas products is the business extension of air separation plant manufacturing.