• grade 1 contractor in electrical & mechanical installation engineering • grade 1 contractor in electronic and intelligent engineering • grade 2 contractor in fire facilities engineering • grade 2 contractor in building decoration and decoration engineering • grade 2 contractor in waterproof anti-corrosion insulation engineering • grade 3 general contractor in construction engineering • class-b special certification of architectural intelligent system design • grade 3 general contractor in petrochemical construction engineering • grade 3 general contractor in municipal public engineering • grade 3 general contractor in electrical and mechanical engineering • grade 3 contractor in steel structure engineering • grade 3 contractor in city and road lighting engineering • grade 3 contractor in environmental engineering • special grade b for architectural decoration engineering • pressure pipe • safety production license • medical instrument business license • bank of china aaa credit rating certificate