Abstract: Groundwater levels of hydropower stations are relatively high in the western alpine gorge area. The external water pressure on the lining of deep buried hydraulic tunnel is larger. So the anti-seepage and drainage measures should be demanded strictly. In order to reduce the seepage pressure and the drainage effect on the underground environment as well as to improve the safety and economy of lining structures, it is necessary to take some effective anti-seepage and drainage measures for surrounding rocks. For a hydropower station under construction, the consolidation grouting and the drainage hole are considered as the anti-seepage and drainage measures respectively. Then, a three-dimensional finite element model of spillway tunnel is established, which can finely simulate the consolidation grouting and the drainage hole. The phreatic surface changing rule of surrounding rocks for the tunnel and the seepage pressure distribution of the lining structure are analyzed. Results show that the seepage discharge from wall rock to tunnel and the influence of drainage on underground water level would decrease if the consolidation grouting is adopted. The consolidation grouting is beneficial for to the environmental protection. In addition, the effects of drainage hole can reduce the seepage pressure on the tunnel lining remarkably. When the influence of drainage on the groundwater environment and the effect of the drainage hole are both taken into account, the treatment scheme combined with deep consolidation grouting and shallow drain holes is proposed, meanwhile the consolidated grouting area and the drain depth are suggested to be 5~ 8 m and 1~ 2 m respectively.