During the process of grouting for seepage treatment of dam foundation overburden under some water head when retaining water， problems such as slurry dispersing， incomplete curtain， large consumption of cement， may be encountered. In reference to field practice， this paper investigates the use of the anti-washout slurry and the paste-like slurry， the injection-after-sealing principle， and grouting in tiers of different types of slurry for the upstream and downstream to solve the technical problems related to grouting of the overburden anti-seepage curtain and control of grouting under pressurized flow water. The technology produced good field results and can provide important reference for similar seepage treatment.