Soil　seismic　response　analysis　is　of　great　meaning　to　the　seismic　response　and　seismic　safety　evaluation　of　structures.　In　this　study,　the　non-linear　seismic　response　law　of　soil　in　free　field　under　uniform　and　non-uniform　excitation　and　its　influencing　factors　are　studied　by　means　of　large-scale　shaking　table　model　test,　which　can　provide　support　for　analyzing　the　seismic　failure　mechanism　of　structures.　By　analyzing　the　dynamic　characteristics　of　soil,　acceleration　peak　magnification　coefficient,　shear　stress-shear　strain　curve　and　soil　settlement,　the　ground　motion　response　characteristics　and　variation　of　free-field　soil　under　different　earthquake　motions　and　different　seismic　intensities　are　studied.　The　results　show　that　the　non-linear　development　degree　of　soil　is　not　only　related　to　the　record　of　ground　motion,　but　also　to　the　input　mode　and　loading　level　of　ground　motion.　In　the　case　of　large　earthquake　or　longitudinal　non-uniform　excitation,　inconsistent　movement　of　free-field　soil　leads　to　stronger　soil　structural　change,　decrease　of　frequency,　increase　of　damping　ratio,　weakening　of　soil　stiffness　and　relatively　faster　nonlinear　development　of　soil.　The　variation　law　of　soil　shear　stress-shear　strain　curve　and　settlement　curve　also　reflected　the　plasticity　development　of　soil.　The　conclusions　obtained　are　consistent　with　the　observed　macroscopic　phenomena　of　the　free-field　seismic　response,　which　mutually　corroborated　the　rationality　of　the　results.　©　2019,　Science　Press.　All　right　reserved.