The　failure　behavior　and　the　vulnerable　position　of　the　bridge　are　studied　by　nonlinear　response　analysis,　based　on　incremental　dynamic　analysis(IDA).　The　damage　index,　applying　for　long-span　continuous　rigid　frame　bridge　with　high　piers,　is　evaluated.　The　seismic　vulnerability　problem　of　the　whole　bridge　is　analyzed　by　using　the　strain　for　damage　index　of　piers　and　the　displacement　for　damage　index　of　bearings.　According　to　the　studies　above,　the　fragility　curves　are　constructed　based　on　integral　performance　of　the　bridge.