The　bridges　play　an　important　transportation　hub　in　the　transportation　lifeline　system.　The　sea-crossing　bridges　located　in　earthquake-prone　areas　may　be　subjected　to　earthquake　and　wave　action　during　their　lifetime.　This　paper　mainly　investigates　the　seismic　performance　of　continuous　rigid　frame　bridges　supported　by　group　pile　foundations　based　on　the　seismic　fragility　analysis.　Based　on　the　OpenSees　software,　the　three-dimensional　finite　element　model　of　the　sea-crossing　bridge　is　developed,　where　the　pile-water　interaction　and　pile-soil　interaction　are　simulated　by　added　mass　method　and　p-y　curve　method,　respectively.　The　uniform　input　ground　motions　are　used　by　applying　the　displacement　of　the　surface　ground　motion　on　all　spring　supports.　Based　on　the　traditional　structural　seismic　vulnerability　analysis　and　introducing　the　theory　of　reliability,　the　damage　index　is　reduced　by　a　half-trapezoidal　distribution　membership　function,　and　the　structural　damage　boundary　is　fuzzy　analyzed　to　obtain　the　fuzzy　components.　Further,　the　damage　limit　about　the　vulnerability　of　the　full　bridge　system　is　discussed.　Finally,　the　influence　of　wave　force　on　structural　seismic　vulnerability　and　the　vulnerability　of　the　full　bridge　model　under　different　earthquake　types,　such　as　far-field,　near-field　pulse,　and　near-field　non-pulse　types,　are　analyzed.