Abstract：Based on the mountain tunnel along Yaan—Lugu highway in strong earthquake area，the dynamic response of mountain tunnel has been analyzed by the means of a large-scale shaking table test. The position of the largest dynamic response of the tunnel and its damage modes are basically the same with that of tunnels damaged in Wenchuan earthquake. The stress state of the tunnel is evidently optimized because of the designed shock absorption layer. There are a lot of longitudinal and oblique cracks on the surface of the tunnel portal，and these cracks extend to the ring cracks and do not propagate. Some shock absorption seams should be designed at the tunnel portal part in order to absorb the earthquake wave energy and protect tunnel structure. These results have a certain reference value for aseismic design and construction of mountain tunnels in strong earthquake area.
