Based on systematic analysis of the composition and mechanism of the debris landslides

this paper first proposes that the monthly rainfall and its change can be selected as the load-unload dynamical parameter

the average displacement velocity and its changes as the dynamical response parameter to load-unload and the displacement load-unload response ratio as the displacement dynamics parameter of debris landslide induced by water in term of the principle of the load-unload response ratio theory. Meanwhile

on the basis of analysis of the data of the displacement and rainfall of the debris landslides in the Three Gorges Reservoirs area

the feasibility and effectiveness of the displacement dynamics parameter are discussed. Finally

the stability of Huanglashi slope in the Three Gorges area before and after the water drainage are evaluated respectively by means of the dynamical parameter of the load-unload response ratio; and the evaluated results are well agreed with the practical stability situation of the slope. Therefore

all results above show that the dynamical parameter of load-unload response ratio proposed is a very effective displacement dynamical parameter in the stability evaluation of debris slopes; and it can be used in the evaluation of the stability of debris landslides induced by water.