By　coupling　the　explicit　finite　element　method　with　the　viscous-spring　artificial　boundary　condition,　the　formulae　for　calculating　the　equivalent　nodal　force　under　the　oblique　incidence　of　plane　seismic　SV　waves　are　deduced.　Then,　the　input　of　SV　waves　is　realized　in　the　FEM　program.　A　half-space　example　with　simple　motion　proves　that　the　proposed　approach　has　satisfactory　precision.　Subsequently,　the　proposed　method　is　employed　to　investigate　the　rock　tunnels　with　two　oblique　incidence　conditions　of　cross　section　and　vertical　section.　The　numerical　results　indicate　that　under　the　action　of　obliquely　incident　seismic　waves,　the　dynamic　responses　of　rock　tunnel　are　clearly　different　from　those　under　the　action　of　vertically　incident　seismic　waves.　In　addition,　the　dynamic　responses　of　the　rock　tunnels　vary　greatly　with　the　incidence　of　SV　waves　in　cross　section　and　vertical　section.