Tonghuai Road (Beijing-Chengde Expressway - Hefangkou) project starts from Dahanzhuang Interchange of Beijing-Chengde Expressway in the South and ends at Hefangkou of National Highway 111. The total length of the road is about 21.5 km. The design grade is grade I highway, and the design speed is 80 km/h. The project is an important connecting channel between the eastern districts of Beijing, and is one of the main roads in the road network structure of Huairou Science City. At the same time, it can divert the cross-border traffic of urban section of National Highway 111, and serve the large-scale activities of Yanqihu Lake International City.