The technology of splitting grouting for earth dam is one of the important technical measures to improve the quality of dam. However, the consolidation mechanism of slurry in the dam is not clear, which can not evaluate the effects of seepage control of the dam after grouting. Therefore, assuming that the construction technology does not change and with the consideration of interaction between the layout of hole-boring distance and the effects of seepage control, the Mohr-Coulomb Hardening model and fluid-solid coupling method were used to analyze the rule of pore pressure, stress and strain in the dam during splitting grouting based on the finite element simulation. The consolidation mechanics was discussed and stability of the dam was evaluated.