The cryogenic air separation plant uses air as raw material, through compression, purification and heat exchange to liquefy air into liquid air. Liquid air is a mixture of liquid oxygen and liquid nitrogen. Using the different boiling points of liquid oxygen and liquid nitrogen, we can separate them by distillation to obtain the required gas. Because of its complex structure, high precision and difficult maintenance technology, the cryogenic air separation plant has high maintenance cost and professional requirements for maintenance personnel. At the same time, the cryogenic air separation plant needs a large area, which requires a high demand for building plant and foundation. The enterprise can customize different design schemes according to its own situation.