According to enterprise data, Yanshan Changan Road and Bridge Engineering Co., Ltd. was established on 2010-13, and its business scope includes general projects: highway engineering and highway subgrade, pavement, bridge, tunnel and traffic engineering construction; Highway major and medium repair project, highway maintenance, highway greening project construction; Labor service (except labor dispatch and labor agency dispatch) and earthwork; Cement stabilized macadam processing and sales; Asphalt concrete processing and sales; Engineering and technical consulting services; Sales of other building materials; Mechanical equipment leasing; Office and civil housing construction; House lease, venue lease. (Except for projects subject to approval according to law, independent business activities shall be carried out according to law with the business license)