Abstract: A series of new views and approches to solving the practical problems of landslide is reviewed in the paper and the recent investigation prediction and prevention of the loess landslides were conducted in the Loess Plateau of China.Based on the existing evidences of irrigation-induced high-speep loess landslide the movement models of this kind of landslide are constructed. The formulae of sliding path, velocity,and distance of the landslide and speed of loess mud flow are deduced on the principle of variation. The whole process of Heifangtai loess landslide located in areas of Liujiaxia,Yanguoxia and Bapanxia reservoirs,Gansu Province are simulated and calculated from these formulae. The obtained results are consistent with the practical cases.