This is a study on the building of the three-dimensional finiteelement model. It takes the continuous beam bridge which is 3í30m in length and 5m in height as an example. The bridge bearings are supposed to be constructed by elastic connect-ion of the bridge girder and pier. To take the bridge as a whole, the interaction between soil and pile foundation should be put into consideration. Soil spring is used to simulate the model, and the seismic effect is input in horizontal and vertical direction of the bridge. The data are analyzed by response spectrum method.%以3×30m连续梁桥为例，在桥墩高度为5m时，建立该桥的三维有限元模型。桥梁主梁和桥墩通过弹性连接来模拟桥梁支座，考虑土和桩基的相互作用，通过土弹簧来模拟，并在桥梁横向和纵向两个方向输入地震作用。采用反应谱法进行分析。
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