In order to study the causes and influencing factors about the deformation and instability of Kuapozu landslide, combined with the existing data and geological survey data to make analysis, structural geology, engineering geomechanics, unmanned aerial vehicle, geophysical exploration and other means were used to carry out the research.The results show that the slope body has the geological conditions of landslide from the whole geological environment; The heavy rainfall for several days in a row increased the weight of the landslide and greatly reduced the stability of the landslide; Under the condition of continuous heavy rainfall (under the condition of saturated water), the slope lost stability, the deformation and failure mode is compression-tension type.