Two tied arc bridge models were established by using the finite element software of Midas/ Civil. The first model is to consider the in-teraction of pile and soil,and the second is to consider the bottom consolidation of bridge pier. The internal force and displacement response of the bridge key interface of the longitudinal(X)and transverse(Y)are analyzed by using the response spectrum analysis method under the earth-quake action. The results of internal force and displacement response of the two models are compared,and the effect of pile and soil interaction on seismic response of bridge is summarized.%通过有限元软件 Midas／ Civil，分别建立了考虑桩土共同作用和桥墩底部固结作用下的两种系杆拱桥模型，采用反应谱分析法，分析了地震作用下纵桥向 X、横桥向 Y 桥梁的关键界面的内力及位移响应，并对比了两种模型的内力和位移响应结果，总结了桩土共同作用对桥梁地震响应的影响。
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