Abstract: In the collapsible loess area,it cant meet the need of strength and deformation characteristic while loess as the main raw material of expressway subgrade.There are three effective and applied treatment methods:vibrating roller compaction,rolling dynamic compaction,and dynamic compaction.According to data from test in situ and indoor test,going along finite element simulation,it concludes that foundation deformation decreases along with the increase treatment energy,embankment self deformation keeps steady.To the treatment depth and deformation minishing effect,the best is the dynamic compaction.The rolling dynamic compaction takes second place.The last is the vibrating roller compaction.Quadratic polynomial regression is used to analyze the correlations between the settlement and deformation of foundation surface center and different road embankment heights.The vibrating roller compaction treatment technology benefits for embankment height 2～4meters.The rolling dynamic compaction treatment technology suits for embankment height 5～10 meters.The height over 10 meters usually be treated with the dynamic compaction or directly make use of bridge to instead of.It is significant to expressway subgrade construction and safeguard in loess area.