Abstract: Because of no experience, the Jicun hydropower station is built on the cretaceous period layer. After water impounding, problems were encountered such as the 108 m2 sludging area, much lower friction coefficients, high uplift pressure at dam foundation, partly disengaging of dam foundation surface and argillaceous sediment in discharge water. By many treatments, the integrated anti-seepage system was formed. Till now, it has been in operation more than 30 years, and its experience and lessons are worthy reference for same projects.