Abstract: According to the specific circumstance of Huangheyuan hydropower project,through the analysis of the two different forms of the typical cross section′s finite element seepage,the seepage safety of Huangheyuan hydropower project is evaluated comprehensively.The results show that there are some defects in the dam seepage system.The joints between horizontal anti-seepage and L-shaped vertical anti-seepage are not closed.The natural seepage condition of the right bank dam basis is poor and anti-seepage treatment is not completely,which lead to large leakage and failure by seepage behind the dam,so the seepage stability of the dam does not meet the regulatory requirements.The grade of dam seepage is C,so appropriate reinforcement measures should be taken and the flow monitoring facilities should be improved too.