Abstract:The study takes 69 m high loess-fill embankment of Lanzhou—Haishiwan expressway of 109th national highway as a case. Through centrifuge test,the distribution laws among high,route-longitudinal section,and transverse section with high loess-fill embankment are presented,and the theoretical results are compared with the actual measurement results. The derived results show that the subgrade settlement-deformation appears“sag”,i. e.,maximal settlement lies in center road and shoulder settlement is minimum;and in the place 1/3–2/3 of embankment height,the tendency shows outward“extrusion”. Embankment deformation change tendency is increasing inward and downward,and it suggests that it should be paid attention to the remarkable change of settlement deformation for high embankment in design and construction to guarantee the safety and stability.