This paper deals with the surface amplification effect of bedding rocky slope with weak interlayer under action of earthquake.Software FLAC3Dwas employed to establish a numerical model with consideration of earthquake input

boundary condition

mesh divison and model parameters.The effects of peak value

frequency

duration and initial direction of earthquake on the surface amplification were analyzed and discussed.The results shown that

（1）the peak value

frequency and initial direction of earthquake ground motion play a significant role in the surface amplification effect of rocky slope

while the duration of earthquake play a small role.（2）With increase of peak value of ground motion and the height of slope

the amplification factor increased

especially in the top corner.（3）When the frequency of ground motion is smaller than the natural vibration frequency of slope

the amplification factor of surface of slope decrease. However

when the frequency of earthquake is greater than the natural vibration frequency of slope

the amplification factor is greater and increases with increase of frequency.