Abstract: Tuohai Hydropower Station was built in 1954 and has operated for 13 years so far. It is found that the seepage at right bank of the dam is of great quantity during the first dam safety periodic inspection and need to be treated. The measures which maintain the existing curtain range and deepen the curtain up to the 830.0 m E.L. in terms of anti-seepage taken in order to make the effect economical and efficient.?