According to Aiqi's inquiry, CCCC Fourth Engineering Bureau was originally named "CCCC Fourth Engineering Bureau Co., Ltd." and was established in 195 1. It is a subsidiary of China Communications Construction Co., Ltd. (a Fortune 500 enterprise), a state-owned enterprise, not a central enterprise, and has the first-class general contracting of port and waterway engineering construction, the first-class general contracting of highway engineering construction, and the first-class design of water transport industry and highway industry. First-class qualification for general contracting of municipal public works, water conservancy and hydropower projects and construction projects; First-class contracting qualification for bridge engineering, tunnel engineering, highway subgrade and foundation engineering. Mainly engaged in domestic and foreign ports, highways, tunnels, urban rail transit, municipal administration, bridges, water environment management, water conservancy and hydropower, ship locks, railways, airports and other large-scale infrastructure construction, as well as related investment and financing, real estate, survey and design, equipment manufacturing, scientific research and development and other businesses, with investment and financing, consulting planning, construction, operation and other comprehensive service capabilities of the whole industry chain.