China Railway Seventh Group Co., Ltd(CRSG), registered in Zhengzhou, Henan Province, is a large state-owned enterprise, which directly sets up for more competitive market structure of China Railway Engineering Corporation(CREC).CRSG possesses Super-class Qualification of Railway General Contract; Class-A Qualification of General Contract for highway, building and municipal works; Class-A ProfessionalQualification of highway subgrade, bridge, hydraulic tunnel, track-laying and girder-erecting works, tunnel, electrification works, and urban railtransit .