Abstract：A systematic study is carried out on the displacement law，the dynamic process and feature of load and unload for the colluvial landslide induced by rainfall in the Three Gorges by means of load-unload response theory. Through analysis on the displacement response feature，the load-unload parameter and load-unload response parameter are determined and its prediction model is also established for this type of landslide. The calculation of load-unload response ratio of monitoring points A3 and B3 of Xintan landslide in China is completed by using the load-unload response prediction model. The computation results show that an abrupt jump occurs in the curve of load-unload response ratio of monitoring points A3 and B3 just before landslide takes place，and the abrupt jump point agrees with the destabilized time of the landslide. All results above show that the load-unload response ratio theory is a very effective nonlinear dynamic one in the short and middle-term prediction of colluvial landslides.
