To　study　the　effects　induced　by　varying　sites　on　seismic　responses　of　a　CFST　arch　bridge,　an　actual　CFST　based　scaled　(1:16)　model　has　been　employed　to　conduct　the　shaking　table　test.　Based　on　the　local　sites　classification　of　NEHRP,　several　real　recorded　ground　motions　at　different　site　conditions　from　the　ChiChi　Earthquake　are　selected　as　the　ground　motion　input,　and　then　a　comparative　test　on　the　multi-shaking　table　array　system　was　carried　out.　During　this　experiment,　the　structure　subjected　to　the　uniform　excitation　are　investigated,　by　considering　the　cases　of　longitudinal,　transverse　and　vertical　ground　motion　input,　as　well　as　the　combination　of　transverse　and　longitudinal　input　and　transverse　and　vertical　input.　This　study　reveals　that　local　site　condition　has　a　significant　influence　on　the　seismic　response　of　the　CFST　arch　bridge.　The　seismic　response　increases　with　the　site　classification　from　A　to　E,　and　the　seismic　response　in　the　E-class　site　is　around　1.6~4.1　times　high　than　that　in　the　A-class.　The　vertical　acceleration　response　of　a　vault　is　much　more　sensitive　to　site　condition　than　the　horizontal.　As　a　result,　the　peak　value　of　vertical　design　spectrum　will　be　smaller　if　the　same　site　coefficient　is　used　with　the　horizontal　one.