Abstract: This paper relies on geotechn ical engineering investigat ion of high loess embankment slope in the oilfield site northw estern of China. It is based on the analysis o f eng ineering geo log ical cond itions and deformation character istics. It stud ies the slope deform ation and failuremechan ism. A three- dimension geo log icalmodel is es tablished to analyze the distribution of stress and stra in of the loess f ill slope. The FLAC3D so ftw are is used to simu late the deform ationm echan ism o f the slope. The numerica l resu lt ind icates that them ain transform and fa il zone beg in from abrupt hole surroundings and follow s face o f slope to get dow n a 20- 25 meter. The bottom interface is the surface o f contact betw een theHo loceneE poch f ill earth storey Q4 and the orig ina l loessQ3. The numerica l re su lt further ind icates that the slope has adequate stab ility aga inst landslide. Any large deformation and fa ilure o f the slope is found to be impossib le.