Abstract：Taking the typical accumulative slope of Huanglashi as an example and considering the special role of groundwater in landslide，the effects of the groundwater seepage on the stability of the landslide are studied quantitatively. The calculating method of seepage is adopted in which the groundwater level approaches to the real situation；and the head of groundwater and the seepage pressure are calculated when the groundwater level changes in the seepage flow field of the Huanglashi slope. Therefore，the role of the groundwater in the Huanglashi slope is quantitatively analyzed. It is found that the maximum value of the seepage pressure is located in the former part of the slope. On the basis of the result，the calculation of seepage pressure is drawn into the Spush method. According to the mean monthly water level，the relationships of the stability coefficient with the time is calculated，respectively，when the seepage pressure is(or not) taken into account. According to the calculation results，the stability coefficient has the decreasing tendency under the periodic action of seepage，and the maximum reduction is seen to be 0.202 0 and it happens when underground water level declines rapidly. It shows that the abrupt decline of underground water level is the most disadvantage factor，and the effect of the seepage pressure on the stability of the Huanglashi slope has increasing tendency. In terms of the former analysis results of the groundwater action law and the distribution of seepage pressure，as well as the actual local situation of the slope，the prevention and control methods are proposed.
