Taking　Ganxigou　valley　in　Sichuan　Province　as　example,　where　earthquake　occurred　at　14:　20　on　May　12th,　2008,　slope,　aspect,　elevation,　river　distribution,　lithology,　faultage,　and　highway　distribution　are　selected　to　assess　landslide　risk　after　earthquake.　The　fuzzy　synthesis　judgment　way　is　applied　to　evaluation,　and　GIS　is　effectively　adopted　in　picking　up　value　and　making　chart.　Through　verification,　these　evaluation　systems　are　viable.