Abstract: Wulong County is located in the Three Gorges Reservoir area and the Wujiang River drainage basin. Its main landform type is mountain, so it is a typical mountainous county and has so many landslide hazards. It is also a national poverty county. In recent years, because of immigrations in the Threegorges area, the construction of the Yuhuai(from Chongqing to Huaihua)railroad and regional economy development, human activities have increased vastly. According to field surveys and data analyses, we concluded:(1)There are 233 landslides sites, with their volume being 1.36×10\+8m\+3,so Wulong county is the heavy catastrophic region in Chongqing and Three Gorges Reservoir area. (2)The classification features of those landslides have several aspects. The dominant types are superficial landslide and surface layer landslide in thickness classification. The main type of substance composition is earth landslide. The primary types are mediummodel landslide and littlemodel landslide in landslide volume classification.(3)In Wulong County there are 46 towns in total and the 233 landslides are distributed in 41 towns. The landslides distribution is not equal in the whole Wulong County. Yajiang and Changba towns have relatively more landslides, with 27 landslides and 25 landslides respectively.(4)The main bedrock stratums are shale and mud rock. The great mass of landslides developed on the slope with the gradient varying from 10 degree to 30 degree.(5)The causes and mechanism of those landslides embody 3 aspects. They are abroadly distributed easyslide stratums, instability of slope structure, influence of landform an geometry and geomorphology, abduction of rainstorm and human activities.

Key words: landslide, classification, cause and mechanism, Wulong County, Three Gorges Reservoir area