The project of Guangba and Guangshan expressway Dashi interworking line is greatly influenced by urban and rural planning, present railway, road and river. In the design, it adheres to the principle of "overall design efficiency, scientific prediction of strong traffic, slow traffic priority, suitable environment according to local conditions, combination of far and near to promote development, characteristics highlight humanities, all efforts to innovate and strive for breakthrough", and practice in key sections such as Nanhe Bridge, underpass railway, terminal connection and so on. It can be used as a reference for similar projects.