Abstract: Geological hazards take place frequently along the highway in the western mountainous area of Sichuan Province. In view of this, we investigate systematically the development rules of landslides and collapses along the Muli county segment of Sichuan provincial highway S216 by using ArcGIS. Results reveal that 85.38% of the geological disasters in the study area develops in the slope body with a gradient ranging from 20 to 50 degrees. Faults, rivers and roads in the study area will all affect the development of geological disasters. Meanwhile, 70% of landslide in the study area distributes in the elevation range between 2 000 and 2 500 m. Collapse in the study area is rarely developed in slopes of true north, northeast and northwest aspects, while landslide slightly develops in slopes of northwest and true north aspects. The research achievements will offer basis for dealing with emergencies and disaster zoning in the study area

Key words: landslide, collapse, Sichuan provincial highway S216, geological disaster, lithology, ArcGIS