Abstract:In order to study highway slope stability and support design in mountainous terrain,firstly the general limit equilibrium method(GLE) and stability analysis method for reinforced slope are explained,and a slope support optimal design system (SSODS) based on component geographic information system (ComGIS)is developed. Then,the main features of SSODS are introduced,which are macroscopical appraisal of slope stability,computation of slope stability,design of reinforced slope,map display ,spatial query and analysis capacity,output and print. Finally,several typical examples are put forward for comparing SSODS with commercial software,SLOPE/W(Alberta Canada,GEO-SLOPE International Ltd) and slide(Toronto Canada,Rocscience Inc). The results prove that SSODS is accurate and credible. Besides,SSODS is also successfully used in the real engineering project.