The alignment design should consider the collocation of horizontal, vertical and horizontal. If the amount of construction is not large, the highway should be constructed with high quality to improve the road quality.(2) the selection of the line should consider the impact on the surrounding environment of the road, reduce the occupation of the land as far as possible, improve the use rate of the land.(3) some sections with bad geology are prone to landslide, debris flow and other hazards after construction, which bring about some hidden dangers to the highway. Therefore, the line selection should take full account of the possible situation, so as to take appropriate preventive measures.(4) the construction of the highway will bring certain pollution to the surrounding environment, so before the construction of the road should be in-depth study of the problems that may arise, so that people and the environment co-exist harmoniously.