To　investigate　the　dynamic　response　of　unsaturated　soils　under　moving　loads,　a　new　soil-water　characteristic　curve　(SWCC)　model　is　established　considering　the　deformation　caused　by　applied　load　based　on　the　traditional　V-G　SWCC　model.　Using　this　modified　SWCC　model,　a　dynamic　governing　equation　for　unsaturated　soils,　which　fully　describes　the　water-force　coupling　effects　of　unsaturated　soils　under　dynamic　loading,　is　derived.　The　governing　equation　is　solved　using　the　2.5-dimensional　finite　element　method　(2.5D　FEM).　The　obtained　solutions　are　compared　with　the　analytical　ones　for　single-phase　medium,　double-phase　saturated　medium　and　three-phase　unsaturated　medium,　respectively,　which　all　confirm　the　accuracy　of　the　proposed　solution　method.　The　computational　time　analysis　for　different　medium　models　demonstrate　that　the　2.5D　FEM　is　an　advantageous　algorithm　for　solving　the　dynamic　problems　of　porous　media.　The　numerical　analysis　reveals　that　using　the　traditional　SWCC　without　considering　the　deformation　will　underestimate　the　vibration　intensity　of　unsaturated　foundations.　©　2025　Chinese　Society　of　Civil　Engineering.　All　rights　reserved.