Abstract: By study on the productive grouting experiment, earthquake accumulative dam was of very good groutablity was testified, the problem of dam leakage can be solved by curtain grouting . Adopting the carbide alloy or diamond aiguille slurry breast wall, piecewise gyration drilling method, orifice close , section division from top to bottom, cyclic hole injection method, it was proved feasible to pour cement clay slurry, increase the hole grouting pressure and carry out a grouting curtain onto the accumulative dam. Adopting three rows of curtain, distributing the injection holes according to the current situation of leakage positions, with 3.5 meter pitch-rowand 1.0 meter- depth into the bedrock, entire, continuous and reliable impervious curtain could be formed, and meet the requirement of seepage prevention. Adopting the techniques of latent hole partiality hammer and pipe- along drilling, multi- level aperture casing pipe drilling, the problem of inspection hole drilling was solved. The inspection hole sections were subjected to pressurized- water test, which truly reflected the stratum permeable characteristic. From injection test data and the quality inspection analysis, it was obvious that injection had fulfilled the purpose of guiding curtain grouting design and construction.