Abstract：The severe environmental temperature variation and special geological condition in Qinghai—Tibet pleateau would induce frost heave and thawing settlement in embankment slope，leading to collapse of slope face due to soil strength decreasing. To ensure man-made slope stability in certain period in permafrost region in pleateu，in-situ experiments of embankment with prefab assemble framework slope protection were designed and carried out in Beiluhe，an area with thick ice in ground. The prefab assemble framework divides large area of embankment slope face into many rhombic pane structures，which decreases the scope and thickness of slope soil collapse. The firm connection of prefab framework with slope face strengthens slope integrity. In the meantime，the soil shear resistance and soil anti-scour ability of embankment slope all increases much. In addition，the two connected assemble frameworks，as one side of rhombic pane，being perpendicular to slope face，allowes little displacement which can release frost heaving force of soil in rhombic pane. The anchor-hold and framework connection realizes the plane protection style with lines joining up with points and planes joining up with lines. The observed data show that embankment with framework froze heave in winter and thawes with settlement in summer. The deformation of thaw settlement and frost heaving tends to be steady year after year. Thus，framework slope protection has good effect for maintaining slope face stability.
