Abstract: The Chalinzhai reservoir has been in operation for many years, and the dam body and foundation have suffered serious seepage. Therefore, it is necessary to carry out anti-seepage reinforcement treatment. The common measures for dam anti-seepage reinforcement were analyzed, and based on the actual engineering geological conditions in the local area, three anti-seepage reinforcement schemes were initially selected: the controllable composite paste grouting and curtain grouting, the high-pressure jet grouting and curtain grouting, and clay solidification agent grouting and curtain grouting. From the technical and economic aspects, the three schemes were compared, and the dam body was determined to adopt controllable composite paste grouting, and the dam foundation was to adopt the curtain grouting for anti-seepage reinforcement scheme. The specific implementation steps and key technical issues of the scheme were discussed.