Abstract: This paper is about the underwater seepage inspections and anti-seepage constructions for the upstream dam face of roller concrete dam. Base on the acknowledgment of the underwater seepage positions and scopes of upstream dam face,applied with the underwater anti-seepage materials, such as SXPBM, LW, SXM and underwater construction technology, carried out the underwater anti-seepage construction on the upstream dam face which is the source of seepage. The seepage velocity of the drain pipe dropped from more than 1000 ml/s to 0.6 ml/s, the water shutoff ratio more than 99.9% and good engineering anti-seepage benefit achieved.?