Research conclusions: As the Qujiang gorge section for the Yumeng railway passing lies in the highly-intensive seismic area, active fault zone nearby and the internal and external dynamic geological disaster is quite remarkable. So it is difficult to choose the site of Qujiang Major bridge-major control work. Nevertheless, the engineering technicians have committed themselves to perform a comparison and research of the local geologic environment and principal engineering geologic problems of 8 bridge sites and 4 route proposals. Finally they determine the C2K route proposal of 5# the bridge site and create the favorable condition for design and construction of project.