Abstract：The reservoir water level in the Yangtze River Three Gorges Reservoir area is adjusted periodically，so the stability of the landslides on both banks is affected seriously. Under the background of the Three Gorges irrigation projects，the influence of drawdown speed of water level on the stability of landslide was analyzed. The variation of the landslide stability at different time during water level drawdown was analyzed considering the actual seepage fields. Through numerical calculation，the relationships of the landslide stability，the seepage coefficient and drawdown speed were obtained. It has some referential values for the study on the sliding stability of slope.
