It has the third-level general contracting for mechanical and electrical engineering construction, the third-level professional contracting for steel structure engineering, the third-level professional contracting for environmental protection engineering, the third-level general contracting for construction engineering, the third-level general contracting for power engineering construction, and the third-level general contracting for electrical engineering construction issued by Jinan Municipal Administrative Approval Service Bureau. Special engineering (structural reinforcement) professional contracting according to the measures of the Housing and Urban-Rural Development Department is not classified