A combined measure of paving compound film on the upstream surface of dam and setting up vertical anti-seepage in dam foundation is adopted to treat leakage.

This paper introduced the geomembrane horizontal seepage prevention measures at the upper reservoir basin at Tai an pumped storage power station, as well as treatments to construction defects.

The research results indicate that the stresses and deformation of the membrane in the anti-seepage system of the dam satisfy the requirement of standard.