1. Obtain the DEM and high-resolution image of the route passing area.
2. Make a preliminary plane alignment.
3. carry out three-dimensional horizontal and vertical alignment.
4. The three-dimensional model alignment is carried out to determine the final route. Compared with the prior art, the method of the invention has the beneficial effects that in the route selection process, different visions of people's left and right eyes can be realistically simulated by 3D stereoscopic display equipment, and the route location can be viewed more intuitively and stereoscopically, and the layout of bridges, tunnels, side slopes, ditches and the like can be refined, so that the road route selection is closely combined with the real three-dimensional landscape on the spot, and the route earthwork volume and project cost can be immediately obtained. So as to facilitate the adjustment after the initial route selection changes and compare with a plurality of initial route selections, and determine that the final route is a truly economical and reasonable route.