Abstract: Some earth dams built in the early stage have experienced dam surface landslide, and there is a relatively weak layer in the dam slopes.To address the seismic problems of earth dam with sliding bed weak zones, taking a sluicing-siltation earth dam as an example to analyze the seismic and stability effects of different reinforcement measurements based on numerical calculation.Results indicate that due to the influence of seismic pore pressure during the earthquake, the effective stress of the weak zone of the sliding bed was reduced, and some of the sliding arcs passing through the weak zone do not meet the requirements of anti-sliding stability.By comparing the combination scheme of vibro-replacement gravel pile-cement mixing pile, and the combination scheme of bank riprap weight-cement mixing pile, it is found that both the two reinforcement schemes can effectively reduce the dynamic pore pressure and improve the anti-liquefaction ability, but the latter has poor effect on improving stability of dam slope with weak zone.The main reason is that the amounts of riprap in some areas are concentrated, and the seismic inertia force of weak zone in sliding bed is increased, which is not conducive to the dam slope stability.The former scheme can significantly reduce the dynamic pore pressure of the dam, reduce the liquefaction range, improve the compactness and strength of the weak zone, thus achieving better anti-sliding effect.