Abstract: During the trial operation of the Three Gorges Project, there are remarkable differences between the deformation of landslides due to different geological conditions and permeabilities. Therefore, besides the geological structure, more attention should be paid to study the regularity of stability variation of different permeability landslides under the condition of reservoir level change. Taking the Huangjingshu landslide at the head area of the Three Gorges as the computation model, the seepage field of 4 landslides with different permeabilities are studied as the water level changes at a steady speed from 0.5 m/d to 2.0 m/d. As the evaluation index, reservoir water influence coefficient, the ratio of water level change speed to permeability coefficient, and stability change ratio is proposed. And the regularity of stability variation is obtained under the condition of permeability and water level change. The results show that when the reservoir water influence coefficient ? changes from -0.107 to -0.322, the stability change ratio ? is the largest; and the ? decreases as ? reduces. When ? changes from-0.644 to -769.231, the ? almost unchanged as ? decreased. When ? changes from 576.923 to 769.231, the reservoir filling had less effect on the landslide stability. When α changes from 0.107 to 384.615, the correlation of ? and ? is not obvious. It has some values for the landslide monitoring and warning in the Three Gorges reservoir area

Key words: reservoir level change, permeability, reservoir landslide, reservoir water influence coefficient, rate of stability change