The　paper　describes　the　field　testing　under　ambient　vibration　on　a　large-span　prestressed　concrete　continuous　rigid　frame　bridge,　named　Houzhu　Bridge,　in　Quanzhou,　Fujian　Province.　The　single-degree-of-freedom　identification　(SDOFI)　method　and　the　peak　picking　(PP)　method　in　frequency　domain　and　the　stochastic　subspace　identification　(SSI)　method　in　time　domain　are　used　for　the　output-only　data　model　identification.　The　3-D　finite　element　model　(　FEM)　is　constructed　and　modal　analysis　is　performed　to　get　natural　frequencies　and　mode　shapes　by　using　ANSYS　software.　The　FE　model　is　calibrated　based　on　the　ambient　vibration　and　parameter　analysis,　and　then　the　baseline　FE　model　is　constructed.　This　calibrated　FE　model　can　serve　as　a　baseline　in　the　longterm　health　monitoring　and　condition　evaluation　of　the　bridge　in　service.