Eco-environment of the main road was investigated,including G108 national road,G109 national road,and the road connecting to Miaofeng Mountain,Dongling Mountain,Baihua Mountain,Tanzhe Temple,and Jietai Temple in the west mountain area of Beijing City.The investigated objects included geography,climate and soil,vegetation,destroyed conditions and restoration of roadside slope.Based on the investigation,evaluation and restoration policies were conducted for roadside slope,which will provide scientific guidance for the restoration of roadside slope in the west mountain area of Beijing City.