The　wave　field　of　artificial　boundary　is　separated　into　free　field　without　local　topography　effect　and　scattering　field　induced　by　local　topography　effect.　In　infinite　ground,　the　influence　of　wave　propagation　on　artificial　boundary　is　realized　by　transforming　displacement　field　as　well　as　velocity　field　to　stress　field　which　are　imposed　on　the　boundary　nodes,　and　scattering　wave　field　is　modeled　as　a　far　field　approximately　solution　introduced　by　Du　Xiuli.　On　this　basis,　the　time　domain　numerical　simulation　of　local　topography　effect　under　obliquely　incident　transient　plane　wave　can　be　performed　in　virtue　of　general　FEM　software.　Thusly,　an　efficient　method　to　calculate　external　source　wave　motion　such　as　local　topography　effect　in　two　or　three　dimension　irregular,　uneven　field　and　soil　structure　dynamic　interaction　is　developed.　The　advantage　of　the　proposed　method　will　simplify　the　analysis　of　nearfield　wave　with　strong　solver　and　pre-post　process　of　general　finite　element　software.　In　fact,　due　to　the　strong　calculation　function　of　general　FEM　software,　the　method　can　easily　applied　to　the　analysis　of　uneven　and　nonlinear　problems.