China No.4 Water Conservancy and Hydropower Engineering Bureau Co., Ltd., referred to as China No.4 Hydropower Engineering Bureau for short, was established in June of 1958 10, and belongs to China Water Conservancy and Hydropower Construction Co., Ltd. It is a first-class professional contractor for water conservancy and hydropower engineering construction, earthwork engineering and steel structure engineering, a first-class professional contractor for municipal public works construction, housing construction, tunnels and highway engineering, and an import and export enterprise qualification.