Ai Nanshan and Wang Minxin The Department of Geology and Geography, Lanzhou University The volume of this landslide is estimated more than 40×l0~6 m~3.By the use of a frictional model with the coefficient of friction (0.26-0.27) which is calculated from the Scheidegger's prediction curve, the largest velocity of the landslide may vary from 40-50 m/s.