Abundant　long-periodic　components　endue　near-fault　earthquakes　with　large　velocity　pulses　while　the　viaducts　owe　long　periodic　fundamental　period.　To　explore　the　seismic　response　patterns　of　viaducts　under　near-fault　earthquakes,　the　paper　analyzed　the　time　history　response　of　a　viaduct　under　near-fault　seismograms　including　TCU　1063,　TCU　065,　El　centro　and　Artificial　wave　via　FEM　software　Civil.　The　analysis　shows　a　significant　boost　in　near-fault　seismic　response　as　the　value　of　PGV/PGA　increased　accordingly,　indicates　that　the　near-fault　pulse　affects　strongly　on　the　structural　dynamic　response　of　the　viaducts.