The basic principle of seismic mitigation and isolation technique on bridge are introduced and the isolation mechanism and mechanics model of the commonly used seismic mitigation and isolation devices are systematically summarized.In this paper

the finite element analysis on the Waisha River Bridge which adopts seismic mitigation and isolation technique is carried out

and at the same time

the strength calculation method of the substructure is described.The viscous damper and high damping rubber bearing are applied to the Waisha River Bridge to research their seismic isolation effect on the bridge.The vibration isolation device is simulated by nonlinear spring element.The study on the seismic response of the bridge with high damping rubber bearing is achieved by using nonlinear dynamic time-history analysis

and then the viscous damper is introduced for comparison.The analysis shows that the bridge structure with isolation device

which is considered as a part of the whole structure

can achieve very good vibration isolation results by making a reasonable distribution of internal force and reducing the relative displacement of the structure.