Base on the analysis of the process of retrogressive landslide

it shows that the characteristics of retrogressive landslide are developed from underside to upside; and its scope becomes larger and larger. The treatment to retrogressive landslide is passive and active reinforcements

but some problems will be brought in by passive reinforcement

such as the decline of shear strength of sliding surface

the expanse of sliding range

the increase of passive reinforcement force

the loss of project budget and the destruction of environmental resources. The inherent strength of potential sliding surface can be utilized by active reinforcement; and then the project budge will be decreased. When passive reinforcement is used in project

the developing process of retrogressive landslide should be considered

the initial sliding mass must be reinforced effectively

the retrogressive mass afterwards should be treated by principle of compensatory reinforcement.