Based on the laboratory direct shear tests， the strength parameters of granite residual soil at different water contents were obtained， and the finite difference software was used to study the dis-placement field， acceleration field and axial force of anchor bolt of granite residual soil slope at differ-ent water contents (13%、17%、21%、25%) and peak seismic acceleration (0.05g、0.1g、0.2g、0.4g). The results show that the horizontal displacement of the slope is mainly concentrated in the residual soil layer under the action of EL wave. The higher the water content and the greater the seismic peak acceleration， the greater the horizontal displacement of the slope at the same location. The amplifica-tion coefficient of PGA increases with the increase of slope height and shows a superficial amplification effect. The higher the water content and the smaller the seismic peak acceleration， the larger the PGA amplification coefficient at the same position. The maximum axial force of the prestressed bolt is locat-ed at the anchor head， and the axial force changes little along the free section， while that of the inner anchor section decreases gradually from the beginning to the end. The higher the water content and the greater the seismic peak acceleration， the greater the axial force of bolt at the same position. When the peak seismic acceleration is small (PGA=0.05g)， the bolt axial force is the largest at the foot of slope. When the peak seismic acceleration is large (PGA=0.4g)， the bolt axial force is the largest at the top of slope.
