Abstract: It is complicated for the comprehensive repair and rehabilitation project design of Fengman dam, especially difficult to identify the scheme of forming anti-seepage system of the dambody. In this paper, the difference between the current situation of the dam body concrete with the criteria requirements was compared, the adequate specification for the grouting curtain was discussed, the suggestion of the grouting and drainage as the main anti-seepage measures was put forward. Also it is suggested that the result gotten form the reducing seepage project of the overflow dam blocks should be considered when it is time to determine the synthetic treatment scheme of Fengman comprehensive repair and rehabilitation project.