Through simplifying models,applying structural dynamical method and elastic theory,the paper solves dynamic response of under-ground structure top plate,and studies the dynamic response of double-span underground structure of mid-pillar under vertical seismic action by taking arching role into consideration. Through checking the computation results,it shows that:vertical earthquake component has significant role for mid-pillar.%通过简化模型，采用结构动力学方法和弹性理论，求解了地下结构顶板的动力响应，研究了中柱在竖向地震作用下双跨地下结构在考虑成拱作用时的动力响应，通过算例的计算结果，表明了竖向地震分量对中柱的作用是显著的。
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