<p>Vehicle traffic can generate repeated stresses on walls, which further cause cumulative deformations that affect the use of tiered geogrid-reinforced soil (GRS) retaining walls. To investigate the dynamic performance of the tiered GRS retaining walls, reduced-scale two-tiered GRS retaining walls were constructed with three wall height ratios (<i>H</i>_U/<i>H</i>_L) and subjected to various loading amplitudes and frequencies. The results indicate that cyclic loading has a significant effect on the performance of two-tiered GRS retaining walls, particularly during the initial stage of loading. The geogrid strains and lateral wall face deformations increased during the initial stage, and then became relatively stable as the cycle number increased under specific cyclic loads. Moreover, once the tiered GRS walls reached a stable state, the change in loading frequency hardly affected the deformation behavior. However, an increase in the loading amplitude led to an evident increase in wall deformation, and then the walls reached a new stable status after experiencing a certain number of cycles. In addition, regardless of the changes in the <i>H</i>_U/<i>H</i>_L values, the location of the maximum lateral wall face deformation remained at <i>z</i> = 0.85<i>H</i>. A linear relationship between vertical strain <i>ε</i>_<i>ν</i> and lateral strain <i>ε</i>_<i>L</i> is observed, where <i>ε</i>_<i>L</i> is approximately 2<i>ε</i>_<i>ν</i> for walls with <i>H</i>_U/<i>H</i>_L≥1. The additional vertical earth stress (Δ<i>σ</i>_v) under cyclic loading has a main influence depth of 0.25<i>H</i> from the strip footing, and the increment of the Δ<i>σ</i>_v decreases with increasing depth from the strip footing. The wall with <i>H</i>_U/<i>H</i>_L =1 had a stronger bearing capacity compared to the other cases, and the locations of the potential slip surfaces were significantly affected by the varying <i>H</i>_U/<i>H</i>_L.</p>