Abstract:Taking the new incubator and the surrounding road project in Chongqing Collaborative Innovation Zone as an example, aiming at the natural terrain of mountain cities, the collection and discharge of rainwater and sewage on the roads and surrounding area after the completion of the plot are solved. At the same time, the design is carried out by considering the combination of flood discharge channels and municipal rainwater in mountain areas. The protection scheme of drainage pipeline in mountain area and the design points of pipeline crossing the gully and river in mountain area are discussed.