Taking Yongding Xinhe Bridge in Tianjin as an engineering background,this paper tests and studies the mechanical properties of viscous fluid damper used in the engineering,and discusses the impacts of viscous fluid damper on anti-seismic performance by using time-history analysis method.The analysis shows that： setting vertical and horizontal viscous fluid damper can effectively reduce the displacement of critical parts under earthquake and improve internal force of structural components.%以天津永定新河特大桥为工程背景,对该工程所使用的粘滞流体阻尼器的力学性能进行了实验研究,利用时程分析法,讨论了粘滞流体阻尼器对该桥抗震性能的影响,分析表明：通过设置纵向和横向粘滞阻尼器,可以有效地降低结构在地震作用下关键部位的位移,改善结构构件的内力。
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