The construction and operation of a set of air separation plant needs to understand customer needs, give technical reply, provide design scheme, determine the dispatch of engineers, installation and commissioning training of air separation equipment, and professional after-sales service, so as to ensure the reasonable design of the equipment, safe and efficient operation, and bring more value to the enterprise. After the completion of a set of air separation plant construction, it is not once and for all, and it is also necessary to provide comprehensive support for customers in the later stage. The DEAR air separation technical service network composed of experienced and skilled debugging experts is active in many areas, continuously improving skills to meet customer requirements.