On the basis of dynamics finite elements theory,rocky slopes with different height and gradiant are computed in the process of modol analysis and time-dependent analysis of seismic acceleration by ANSYS software.Some new dynamic response laws and phenomena are found through the research.The modol analysis shows that the natural vibration frequency of slope dropped as rising of slope height;while the changes of slope angle acts contrary to the natural vibration frequency.Time-dependent analysis of seismic acceleration also indicates that the displacement,speed and acceleration of slope response in the similar way.The amplitude of time-dependent curve of slope crest displacement evidently increase as the increasing of the slope height,nevertheless,the slope crest displacement changes slightly when the slope height reaches a certain degree（about 200 m）,meanwhile,the ground motion responsed at the slope crest has a obvious hysteresis comparing to the slope foot.Furthermore,the slope crest displacement has a linear upward trend with the increasing in slope gradiant,besides,the attenuation effect of seismic wave and the amplification effect of slope exists at the same time.The results would have a great reference value to aseismic design of slope.