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The method of inputting the seismic wave determines the accuracy of the simulation of soil-structure dynamic interaction.The wave method is a commonly used approach for seismic wave input,which converts the incident wave into equivalent loads on the cutoff boundaries.The wave method has high precision,but the implementation is complicated,especially for three-dimensional models.By deducing another form of equivalent input seismic loads in the finite element model,a new seismic wave input method is proposed.In the new method,by imposing the displacements of the free wave field on the nodes of the substructure composed of elements that contain artificial boundaries,the equivalent input seismic loads are obtained through dynamic analysis of the substructure.Subsequently,the equivalent input seismic loads are imposed on the artificial boundary nodes to complete the seismic wave input and perform seismic analysis of the soil-structure dynamic interaction model.Compared with the wave method,the new method is simplified by avoiding the complex processes of calculating the equivalent input seismic loads.The validity of the new method is verified by the dynamic analysis numerical examples of the homogeneous and layered half space under vertical and oblique incident seismic waves.