In　the　seismic　response　analysis　of　liquefiable　sites,　the　existing　soil　dynamic　constitutive　model　is　challenging　to　simulate　saturated　sand＇s　post-liquefaction　deformation,　and　the　current　pore-water　pressure　buildup　model　cannot　reflect　the　decrease　in　the　actual　pore-water　pressure　under　unloading　stress.　We　aim　at　these　problems　to　propose　a　feasible　and　straightforward　time-domain　post-liquefaction　deformation　constitutive　model　through　experimental　analysis　and　theoretical　research,　consisting　of　reversible　pore-water　pressure.　According　to　the　dynamic　triaxial　test　data,　the　regularities　of　large　deformation　stress　and　strain　behavior　of　the　saturated　sand　after　liquefaction　are　obtained,　and　the　corresponding　loading　and　unloading　criteria　are　summarized.　Combined　with　the　effective　stress　constitutive　model　proposed　by　the　author,　a　soil　dynamic　constitutive　that　can　describe　saturated　sand＇s　post-liquefaction　deformation　path　is　obtained.　According　to　the　test　results,　the　model　can　simulate　the　deformation　of　saturated　sand　during　the　whole　liquefaction　process.　The　self-developed　program　Soilresp1D　realized　the　dynamic　response　analysis　of　the　liquefiable　site,　and　the　results　were　compared　with　the　experimental　results.　It　shows　that　the　model　based　on　the　effective　stress-modified　logarithmic　dynamic　skeleton　and　post-liquefaction　deformation　constitutive　can　be　directly　applied　to　the　dynamic　response　analysis　of　the　liquefiable　site.