An　analytical　and　experimental　modal　analysis　has　been　carried　out　on　the　Qingzhou　cable-stayed　bridge　in　Fuzhou,　China.　Its　main　span　of　605　m　is　currently　the　longest　span　among　the　completed　composite-deck　cable-stayed　bridges　in　the　world.　An　analytical　modal　analysis　is　performed　on　the　developed　three-dimensional　finite　element　model　starting　from　the　deformed　configuration　to　provide　the　analytical　frequencies　and　mode　shapes.　The　field　ambient　vibration　tests　on　the　bridge　deck　and　all　stay　cables　were　conducted　just　prior　to　the　opening　of　the　bridge.　The　output-only　modal　parameter　identification　is　then　carried　out　by　using　the　peak　picking　of　the　average　normalized　power　spectral　densities　in　the　frequency-domain　and　stochastic　subspace　identification　in　the　time-domain.　A　good　correlation　is　achieved　between　the　finite　element　and　ambient　vibration　test　results.　It　is　demonstrated　that　the　analytical　and　experimental　modal　analysis　provide　a　comprehensive　study　on　the　dynamic　properties　of　the　bridge.　The　ambient　vibration　tests　are　sufficient　to　identify　the　most　significant　modes　below　1.0　Hz　of　this　kind　of　large　span　cable-stayed　bridge.　The　validated　finite　element　model　with　respect　to　ambient　vibration　test　results　can　serve　as　the　baseline　for　a　more　precise　dynamic　response　prediction　and　long-term　health　monitoring　of　the　bridge.　(c)　2005　Elsevier　Ltd.　All　rights　reserved.