Abstract: In order to realize the feedback analysis of reinforcement effect from seepage monitoring data of the earth rock dam,taking a reservoir main dam as an example,a three-dimensional seepage model is established for finite element calculation,and the seepage condition of earth-rock dam under normal storage level and design flood level is simulated and analyzed. The analysis of monitoring data shows that the finite element calculation results can reflect the relatively real seepage field of the earth rock dam. The overall anti-seepage effect of the earth rock dam after danger removal and reinforcement is good. There are potential seepage overflow points in the downstream of the right bank of the dam and the upper part of the ridge drainage. The calculation results of the seepage field of the main dam of the reservoir accord with the seepage law of earth-rock dam. The results provide a reliable scientific basis for the analysis of dam seepage.