The Zhoutou Reservoir dam was originally a core wall dam, but due to the collapse of the dam, the upper part of the core wall was disconnected. In order to solve the problem of upper seepage prevention, an anti-seepage inclined wall was originally added. According to the safety demonstration and analysis of the Zhoutou Reservoir dam, in order to solve the weak leakage surface and dam foundation leakage caused by multiple landslides of the dam, bedrock curtain grouting, contact surface grouting and flushing were adopted for vertical anti-seepage. Impervious bodies such as backfilling curtains and high-jet impervious panel walls for grabbing wells are formed. The upper part of the inclined wall is covered with composite geomembrane for seepage prevention, and the lower part is connected with the vertical impervious wall, and the elevation reaches 358.0m (0.97m higher than the check flood level).