Construction of building decoration projects; Construction of housing construction projects; Construction of steel structure engineering; Construction of intelligent building installation engineering; Construction of mechanical and electrical equipment installation engineering; Construction of ancient garden architecture projects; Engineering survey and design; Sales: mechanical equipment and accessories, hardware products, metal materials and products, building materials, fire equipment, steel, social public safety equipment, lighting equipment, wooden products, glass products; Mechanical equipment installation; Pipeline and equipment installation. (Projects that require approval according to law can only be operated after approval by relevant departments)