Curtain grouting is a common technical method for dam foundation anti-seepage treatment. Because of karst development in karst areas where karst fissures and channels crisscross， and it is difficult to find out their regularity， the grouting volume is often high. In order to effectively control the cost of curtain grouting and ensure the construction quality of curtain grouting， it is necessary to adopt proper and reliable construction technical measures and means to control and improve the situation of high grouting volume. In relation to the high volume consumed in curtain grouting for the karst dam foundation of a hydropower station， comprehensive exploration and application of specific technical measures and control means was conducted to achieve the purpose of dam foundation seepage prevention with the curtain grouting time reduced to the minimum and the cost of high material consumption effectively controlled， as well as some experience gained for curtain grouting for similar projects.