Design, manufacture, processing of general machinery equipment; class I, II, III pressure vessel, complete set of air separation plant; Complete set of multi-component gas liquefaction & separation plant; cryogenic liquid storage facilities and industrial and mining equipments; Environmental protection equipments, such as city sewage treatment, industrial sewage treatment, solid waste treatment equipments etc. The engineering design and erection of above equipments; design and erection of industrial and civil building. Manufacture and sale of (liquid) oxygen, (liquid) nitrogen, (liquid) argon and special gas.