General business projects: Installation of electromechanical equipment; Water pollution, air pollution prevention and control and environmental protection engineering; Indoor and outdoor decoration and decoration engineering, building intelligent engineering, security engineering, municipal engineering, industrial and civil construction engineering, urban road lighting engineering, waterproof and anti-corrosion and heat preservation engineering, water conservancy and hydropower engineering, highway engineering, railway engineering, mining engineering, building curtain wall engineering construction; Steel structure design and installation; Installation and construction of fire fighting facilities and sports facilities; Technology research in the field of intelligent technology, building intelligent systems, air purification equipment, refrigeration equipment, water treatment equipment, engineering automation equipment and accessories, solar energy products, fire fighting equipment and equipment, electronic products, office equipment, office furniture, chemical products (excluding hazardous, monitored, and precursor chemicals) 2. Sales of hardware, household appliances, decoration and decoration materials and stereo garages. (The above-mentioned business scope excludes the special control projects and pre-licensed projects specified by the state)