Huangtupo landslide is studied in detail as a typical example in the Three Gorges reservoir area. Combined with the monitoring data of the groundwater table of the landslide

the impact of reservoir water level variation on groundwater table of the landslide is studied. A finite element computational model of Huangtupo landslide is established for seepage analysis; and the reasonable boundary condition of the model is defined. The transient seepage field of Huangtupo landslide under water level variation is computed using SEEP/W program of Geo-Studio analysis software. Moreover

the dynamic variation of the phreatic line is also analyzed. It is found that the impact area of water level variation on phreatic line is within the range of 300m in the front of the landslide. The location of phreatic line in the front of the landslide is predicted when water level rises and decreases. The stability affected by the phreatic line changing in reservoir bank landslide under water level variation is analyzed. This paper offers a useful reference for the study of phreatic line and stability analysis of reservoir bank landslide.