Abstract:To perfecting the emergency disposal work and the post-disaster rehabilitation and reconstruction work of the landslide lake

choosed seven indexes based on the natural and social property to constitute the risk evaluation system of landslide lake. Including landslide lake scale

composition makeup of landslide dam

landslide dam height

rainwater-collecting area

population density

economy density and psychology panic degrees. And then made a risk evaluation of the nine landslide lakes reduced by Wenchuan Earthquake base on the generalized entropy method. The result showed the social property indexes have an obvious effection to landslide lake risk

so the social property risk factor should be paid more attention to in the emergency disposal work and the post-disaster rehabilitation and reconstruction work.