Abstract: Gongshan-Dongchuanexpressway project is located in the tectogenesis, theformation of debris flow in dongchuan, complicated topographic and geologic conditions. The project survey and design adhere to the sustainable development the layout of thought, with safety as the basis, take the quality as the lifeline, dominated by science and technology, combinedwithcomplex geological conditions in the region, Implementing the standard line selection, security line selection, topography and line selection, the geological line selection, the design principle of ecological environmental protection concept, Scientific reasoning to choose, to ensure the quality of the design. Theories and methods for mountain road line selection should be studied.