The slope disaster and the flood disaster by earthquake and the heavy rain occur frequently in Japan. The method of measuring geographical features at the disaster area and their change has advanced in recent years. Especially, the Airlines Laser measurement has been used to estimate the amount of earth and sand, and flood damage. In this research, the earth flow disaster, which occurred in Miyajima Island in Hiroshima Prefecture on September 6, 2005, was examined on the basis of the Airlines Laser data. As a result, the amount of earth and sand was estimated from difference of elevation at the mountain stream area by using the Airlines Laser data that was observed after the disaster.