Abstract: There is no aceptance after its completion of Tuohai hydropower station due to historical cause, which made its operation to be inconvenient. The expert team considered that it meets the specification basically and operates normally by design check, construction countercheck, operation summary and comprehensive analysis as well in the first dam safety periodic inspection. However, the by-pass seepage in right bank is still of great amount and also severe seepage at entrance section in sand escape tunnel which needs to be treated in time.?