In order to precisely analyze the stability of reinforced soil slope under the action of earthquake load, a method combining finite element method, pseudo static analysis and strength reduction method are adopted to calculate the safety factor of reinforced soil slope under condition of earthquake load. The results show that the stability of reinforced soil slope is more sensitive to the acceleration of horizontal. In the analysis, the most acceleration of horizontal is -0.154 g and the most acceleration of vertical is 0.318 g.Through the calculation of seismic acceleration of different directions, the surface diagram of safety factor of reinforced soil slope under earthquake load is obtained. And is defined to evaluate the effect of earthquake of different directions and the horizontal direction is the most dangerous. This research provides some effective reference for the earthquake resistant design of reinforced slope.