Based on in situ investigation，observation，and test,green plant,slope soil physical and chemical properties,and plant community composition on the Huangling --Yan'an Highway are studied. Through analyses,plant species in the central reserve,platform and slope,and the advanced allocation model are summarized and the reasons of soil nutrient pool and improving measures are analyzed. Accordingly，several relevant conclusions are made. Soil fertility and plant restoration is complement and soil fertility is gradually restored with time after artificial vegetation construction. The number and proportion of species have a great change with the passage of time,which is beneficial to plant community of slope to reach structural stability.