Abstract: In early morning of July 6, 2016, there took place a large debris flow disaster in Liucun, Yecheng county of Xinjiang. The event made serious villagers death and property loss. The paper, adopting the methods of in-situ investigation, witness interviewing and remote sensing explanation, based on the topography and morphology, lithologies and geological structure, as well as the climate and hydrology, analyzes the characteristics and formation of the landslides, the conditions and hazard chains and disaster mechanism of the debris flow. It also predicts the trend of landslide/debris flow in this area. The in-situ investigation shows (1) in the adjacent area between Liucun and Qichun of the northern slope of West Kunlun Mountains, 38 landslides were triggered by a rainstorm in that day. The landslides are shallow, loess type with the mechanism of Creeping-Tension, and some big landslides have the characteristics of long-runout. (2) the landslide debris accumulated in the gully of "V-shape" to form dams. Among which, there were 15 landslides and 2 dams in the upstream of Liuchun. Under the action of rainfall and small debris flow upwards, the dams are outbreak to form debris flow.(3) there exist more than 227 loess slopes under deforming in the both sides of "V-shape" gully, in the condition of climate change and the increasing of extremely climate events, those slopes would take place similar landslides. The size could be much larger than that of this time. At last, it is suggested to promote advanced research to the mechanism of the shallow loess landslides, the critical rainfall strength, and the movement of mud flow, and strengthen the study of the monitoring, prediction and early alarming of such landslide-debris flow geohazard chains.