In the service trade field, CHC has developed long-term strategic cooperation relationships with 117 large-scale enterprises and public institutions, with the annual amount of labor service export up to about 10,000; provided electric-power wireless private networks and tri-networks integration supporting for hundreds of clients in the following industries such as broadcasting and TV, China Mobile,China Unicom, China Telecommunications, public security, the troops, financial industry and coal mines; established the professional tendering corporation and auction corporation, undertaking businesses as to bidding and tendering as well as the auction of fixed assets.