A new method was presented to determine the safety factor of wall stability against overturning based on pseudo-dynamie approach.In this time-dependent method,the actual dynamic effect with variation of time and propagation of shear and primary wave velocities through the backfills was considered.Planar failure surface was considered behind the retaining wall.The results were compared with those obtained from Mononobe-Okabe theory.It is found that there is a higher value of safety factor by the present dynamic analysis.The effects of wall inclination,wall friction angle,soil friction angle and horizontal and vertical seismic coefficients on the overturning stability of retaining wall were investigated.The parametric study shows that both horizontal and vertical seismic accelerations have decreasing effect on the overturning stability of retaining wall.