Abstract: Based on the preliminary survey results and investigation reports, the landslide volume in Qulong Village, Quma Town, Yunyang County, Chongqing is about 468 × 10 cubic meters. The size of this landslide belongs to a large landslide and this landslide is currently at the stage of creeping compression deformation, which may cause overall sliding hazard. Throughout several field detailed investigations, detailed exploration and engineering monitoring, the possibility of the existence of the largescale landslide, the basic characteristics and stability of the landslide are analyzed and studied. The results show that; (1) The landslide area has a three steps terrace topography in the rolling hill area with tectonic eroded cuttings. Its geologic formation is the same as the slope cross the river. (2) There is no previous large landslide in the study area. The landslide is only composed of four small to mediumsized independent landslides, and the maximum volume of a single landslide is about 15.7 × 104 cubic meters, and other slopes are generally stable; (3) Landslides are triggered by many factors such as, the prone sliding formation of sand mudstone, the steep and gentle terrain, large amount of surface water infiltration, etc.; (4) The sliding mitigation support and drainage measures are adopted for the No. 2 and No. 4 landslides which have direct threat objects. These measures effectively improve the stability of the landslides. The results can provide a reference for the judgement and mitigation of similar landslide hazards.

Key words: Three Gorges Reservoir Area, LargeScale landslide, Identification, Stability: Mitigation Measure