A　series　of　shaking　table　tests　on　a　sawdust-mixed　clay　site　model　are　conducted　under　uniform　earthquake　excitation　using　the　shaking　table　testing　system　with　9　sub-tables　in　Beijing　University　of　Technology.　The　tests　are　performed　using　a　rigid　prefabricated　continuous　model　box　with　dimensions　of　7.7　meters　long,　3.2　meters　wide　and　1.2　meters　high.　The　test　system　is　subjected　to　strong　ground　motions　from　El　Centro　record　and　Tianjin　record.　Through　the　horizontal　longitudinal　and　horizontal　transverse　free-field　shaking　table　tests,　the　boundary　effect　of　the　model　box　is　investigated,　and　its　dynamic　characteristics　and　variation　laws　are　given.　The　partial　test　results　are　analyzed,　including　the　peak　ground　accelerations　and　their　amplification　factors,　acceleration　time　histories　and　their　Fourier　spectra　for　the　site　responses.　The　test　results　indicate　that　the　boundary　effect　of　the　model　box　is　small　because　there　is　only　a　slight　difference　in　the　accelerations　of　site　responses　at　the　same　elevation.　With　the　increase　of　intensity　of　the　input　ground　motion,　the　peak　ground　acceleration　of　the　site　response　at　the　same　test　point　increases,　but　its　acceleration　amplification　factor　decreases,　and　the　main　frequency　components　move　from　high　to　low　frequency.　It　means　that　the　soil　becomes　softer　and　the　soil　modulus　decreases　gradually　with　the　increase　of　the　intensity　of　input　ground　motion.　©　2017,　Editorial　Office　of　Chinese　Journal　of　Geotechnical　Engineering.　All　right　reserved.