Abstract: In the Three-Gorges Reservoir area on Changjiang River, million people are mostly relocating from the previous sites backward to new sites, where geological conditions are complex, landslides and collapses were frequent. Thus, the geologic hazards could affect the safety of residents. Our government has paid great attention to the prevention and treatment of the geologic hazards in the reservoir area. After investigation and study for decades, at present stage an investment is made for large-scale prevention and treatment of geologic hazards. This paper deals with the characteristics of geologic hazards in the reservoir area, previous history of their prevention and controlling, the main issues in study at present stage and the main problems to be further studied.