Grouting is the basic means to solve the seepage problem of earth rock dams.A composite cement base water glass double liquid grouting material is put forward.Combined with the advantages and disadvantages of composite cement slurry and chemical slurry，a composite cement-water glass double-liquid grouting material is proposed.The optimum mixing ratio of the slurry was determined through experiments，and specific construction methods were elaborated to provide theoretical support for the anti-seepage construction of similar projects.