The Three Gorges Reservoir area is prone to the occurrence of geohazards.Reservoir impoundment will reduce slope stability and result in the active geohazards

such as landslides and rockfalls.The future geohazard activities in the area after reservoir impoundment can be divided into following stages:increasing stage

intensive stage

decreasing stage

and quasi stable stage.The harmfulness is not only related to the size

location

and activity of geohazard body

but also to the importance

damage pattern

and treatment difficulty of the affected objects.Surges in the reservoir trigged by large landslides and rockfalls may cause severe second hazards in the bank area.Based on the activity tendency

damage characteristics

affected object importance of geohazards in the facing slope zone to the reservoir and by considering the uncertainties of understanding geohazards and the social and economic development level in the area

a mitigation principle of “taking actions that suit affected objects

giving first place to avoidance and second place to engineering work

”and the related measures to the principle are proposed.