Abstract：The earthquake is one of main factors resulting in failure of underground caverns. The dynamic response analysis of rock caverns under seismic load is a hot issue during the construction of hydraulic engineering in highly seismic region in West China. The dynamic time-history response analysis method is used to analyze the dynamic stability of Liangjiaren Hydropower Station on the Jinsha River. The trends of relative displacement and point safety factor of underground caverns are studied under the natural seismic wave；and the changing law of displacement when the seismic wave passes through caverns is analyzed；also the aseismic effect of lining is discussed. The results show that seismic wave propagation is affected by medium，structural plane distribution and cavern free surface；the fluctuating laws of the maximum relative displacement and point safety factor are similar with those of seismic spectra and the vibration is enlarged around the rock caverns；also bigger permanent displacement has not been discovered in underground cavern walls and fault F4. After the lining has been applied，the vibration intensity is reduced，the stiffness of the surrounding rock is increased and the surrounding rock bears a larger seismic load，producing a smaller displacement when the lining has bigger rigidity；also the maximum relative displacement and the permanent displacement decrease by 10.88% and 29.20% respectively. The practice shows that the aseismic effect of underground caverns with lining is good. The presented research can provide some references to similar projects.
