Abstract: This paper discusses the landslide occurred during the dam construction. The scale of the landslide induced by water-fog from ski-jump energy dissipation is up to the millions of cubic metre; its occurrence has the special reasons, for instances, arid climatic factor and the existence of the F306 fault on the background of special geological condition. Simultaneously, the deformation and slide show that the jump head is not much high and the quantity of ski-jump flow is not so much which induced the slope instability. It is also of practical reference to the projects located in the non-dry region that are of the high jump head and big fall. The recognition for the landslide induced by water-fog has much developed in China since the event occurred. The concept of landslide induced by water-fog is practically founded at the first time and will attract more and more attentions.