Abstract: The choice of foundation treatment method for open cut section of high-speed railway tunnel in loess area should focus on eliminating double standards of collapsibility and controlling settlement and deformation.In this paper,Yuzhong county,Lanzhou city,taking a loess high-speed railway tunnel excavation section of the foundation treatment as an example,the use of cement-soil compaction pile for foundation treatment occurs when the hole collapsed and shrinkaged,changed to bored pile,and reinforced concrete rigid support plate is set to the top of the pile,the pile-plank structure has good effect of foundation treatment.It is shown that the method of foundation treatment in loess tunnel should be selected rationally according to the technical and economical comparison with the factors such as water content,collapsibility and so on.