Fly ash acts as an advantageous backfill material due to its low unit weight and greater shear strength. From literature, it can be seen that very limited studies correlated to the utilization of fly ash as backfill are carried out. Also, understanding the behaviour of Geosynthetic Reinforced Soil (GRS) bridge abutments is not clear. This study carries out numerical analysis of a GRS bridge abutment using fly ash as the backfill material, at the end of construction, using the ABAQUS software. Also, a parametric study to investigate the effect of fly ash friction angle and stiffness of reinforcement is carried out. The results showed that friction angle along with reinforcement stiffness considerably influence the deformation of abutment.