Abstract：Two universal exponential laws for critical displacement evolution of landslides and avalanches are put forward according to the locked patch concept and renormalization group theory in a new viewpoint. It is found that the critical instability displacement of slopes has a dependency on the displacement at the onset point of accelerating creep and the number of locked patches. The first law is suitable for the analysis of brittle failure of slopes，such as rock avalanches，rock-falls and rock toppling failures. The second law can be applied to the prediction of creep failure，such as rockslides，colluvial-deposit landslides and loess landslides as well as clay landslides with locked patches. The two laws have wide suitability and applicability by analyzing a few typical examples of landslides and avalanches. The suggested method could be hopefully applied to the medium-term，short-term and critical-sliding prediction of landslides and avalanches in the future.
