Research purposes: Yuqia-Yiliping railway is located in the northwest edge zone of the Qaidam Basin which has harsh natural environment and complex geological conditions. It crosses the world' s largest Yardang landform (commonly known as 'the devil city')，in which sand storms and saline soil pervade，weak soil and salt rocks exists in the low-lying area of lake basin. It plays a key role in reducing post-survey and design difficulty，cutting down investment and lowering ongoing maintenance costs by conducting the geological route selection in this area. This paper is aimed at researching how to choose the engineering principles of the appropriate geological route selection as the Yuqia- Yiliping railway crosses the geological engineering like sand storms，weak soil，saline soil and salt rocks.
Research conclusions:(1)In the process of geological route selection，a combination of exploration methods such as remote sensing, geological mapping, drilling, and test are used，and the engineering geological conditions along the line are made clear. ( 2)The main decisive factors of the engineering geological conditions in the route selection are sand， soft soil，saline soil，salt rock，the”avoidance oriented" principle should be followed in the route selection.(3)By comparing the north line scheme(CK)，middle line scheme(C9K) and the south line scheme(C10K)，the middle line scheme outperforms the other two，thus be recommended. (4)This research should be of some value to the route selection of the engineering project in the similar area for reference.
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