The ecotype technology of slope protection is being used more and more widely.Ecotype soil stabilizer is a kind of newly developed soil modification material

which can not only stabilize soil grains but also promote plant growth.In this paper

an independently developed ecotype soil stabilizer was adopted in a test expansive soil slope located in Ning-Huai expressway

and the influence of shear strength and thickness variation of the slope surface soil layer modified by the soil stabilizer on the slope stability was analyzed with FLAC-3D numerical simulation software.The research indicates that ecotype soil stabilizer not only can prevent soil erosion from the slope wash out and benefit plant growth

but also can raise the stability of a slope.