Licensed project: Construction engineering construction; Residential interior decoration and decoration; Construction labor subcontracting (projects that require approval according to law can only be carried out after being approved by relevant departments, and specific business projects are subject to approval documents or permits) General projects: Sales of building materials; Sales of building decoration materials; Sales of lightweight building materials; Sales of metal materials; Retail of hardware products; Wire and cable management; Residential water and electricity installation and maintenance services; Sales of building blocks; Sales of lime and gypsum; Loading, unloading and handling; Rental of mechanical equipment; Sales of sanitary ceramic products; Sales of architectural ceramic products; Sales of fire-fighting equipment; Sales of doors and windows; Sales of new membrane materials (except for projects that require approval according to law, independently carry out business activities that are not prohibited or restricted by laws and regulations)