Abstract: Modular panel Geosynthetic Reinforced Soil (GRS) abutments has been widely used due to its advantages of simple construction,economic benefit,low maintenance cost and environmental protection.Based on the half-scale large shaking table model tests,the dynamic response of modular GRS abutment under earthquake action was studied.The changes of horizontal displacement,top settlement,natural frequency and damping ratio and the distribution of acceleration amplification were obtained.The results show that the displacement value of the wall panel increases gradually with the increase of peak acceleration,and the maximum displacement occurs at the top of the wall panel.The displacement mode of the wall panel is mainly rotation.When the bridge was input to 0.4g WL wave,the settlement value of the reinforced area and the non-reinforced area reaches the peak,2.03mm and 5.24mm respectively,which are less than the 1%H settlement requirement in FHWA specification;the natural frequency of the model in different vibration stages ranges from 14.31Hz to 14.83Hz,and the damping ratio decreases overall.According to the measured results,the acceleration amplification coefficient distribution formula for modular GRS abutment was proposed.