The　Guangzhou　New　TV　Tower　(GNTVT)　in　Guangzhou,　China,　is　a　supertall　tube-in-tube　structure　with　a　total　height　of　600　m.　A　complicated　structural　health　monitoring　(SHM)　system　consisting　of　over　800　sensors　has　been　implemented　to　the　GNTVT　for　both　in-construction　and　in-service　real-time　monitoring.　By　making　use　of　this　SHM　system,　the　ambient　vibration　measurement　is　carried　out　in　a　continuous　and　long-term　manner.　This　paper　presents　the　analytical　and　experimental　modal　analysis　of　the　tower　and　the　field　ambient　vibration　measurement　at　different　construction　stages　and　under　different　excitation　conditions,　particularly　addressing　the　following　issues:　(1)　a　reduced-order　FE　model　for　the　GNTVT;　(2)　field　vibration　measurement　and　modal　parameter　identification　of　the　tower　under　construction　and　two　environmental　excitations　(typhoon　and　earthquake);　and　(3)　comparison　of　results　under　different　excitation　events　in　the　time-frequency　domain　and　correlation　between　natural　frequencies　and　air　temperature　using　linear　regression　analysis.　The　experimental　dynamic　characteristics　of　the　tower　can　be　used　to　update　the　finite　element　of　the　tower,　so　that　the　updated　finite　element　model　of　the　tower　can　be　obtained,　which　will　serve　as　the　baseline　model　for　future　health　monitoring　and　damage　detection.　They　can　also　be　used　to　verify　the　effectiveness　of　vibration　control　devices　installed　on　the　tower.　©　2011　Elsevier　Ltd.