In order to study the influence on slope stability produced by the coefficient of conductivity

descendent speed and time of reservoir’s water level

combined with a certain project

the numerical simulation of many schemes has been done. It is shown that the depth of the slip arc becomes bigger and the appearance of deep slide becomes easier with the bigger descendent speed of reservoir’s water level. The tendency of slope’s safety factor first becomes decrescent and then increscent with the decrease of the reservoir water level and the increase of the persistence of time. The critical reservoir’s water level and critical persistence of time are different for different decrescent speeds of water level. The bigger the influence on the stability of the slope produced by the coefficient of conductivity and the bigger of coefficient of conductivity

the better to the stability of the slope.