The document discusses landslides that have occurred along the banks of the Dagangshan reservoir in China since its impoundment. It identifies seven unstable deformation slopes composed of accumulated landslides and weathered rock landslides. The landslides are associated with reservoir water levels and precipitation, and are also influenced by human disturbances. They are mainly distributed in areas with faults and seismic activity in deposits and weakened rocks. Two typical failure models are proposed to explain the failure mechanisms of the deformation slopes. While landslides are less severe than other reservoirs, fluctuating water levels and geological conditions are factors in the landslide development.