Much　attention　was　paid　on　the　selection　of　damping　parameters　for　complex　structures　during　nonlinear　time-history　response　analysis.　In　the　paper,　study　was　made　on　the　applicability　of　damping　method　to　complex　bridges.　While　analyzing　seismic　response　of　complex　bridges,　comparative　analysis　between　the　Rayleigh＇s　damping　method　and　strain-energy　proportional　damping　method　was　carried　out,　and　the　applicability　of　two　methods　was　discussed.　For　the　complex　type　of　bridges,　the　precision　of　damping　parameters　from　the　strain-energy　proportional　damping　method　is　higher　than　that　from　Rayleigh＇s　damping　method,　and　the　using　of　strain-energy　proportional　damping　method　is　desirable.