Seismic　stability　of　slopes　has　been　traditionally　analyzed　with　vertically　propagated　earthquake　waves.　However,　for　rock　slopes,　the　earthquake　waves　might　approach　the　outcrop　still　with　a　evidently　oblique　direction.　To　investigate　the　impact　of　obliquely　incident　earthquake　excitations,　the　input　method　for　SV　and　P　waves　with　arbitrary　incident　angles　is　conducted,　respectively,　by　adopting　the　equivalent　nodal　force　method　together　with　a　viscous-spring　boundary.　Then,　the　input　method　is　introduced　within　the　framework　of　ABAQUS　software　and　verified　by　a　numerical　example.　Both　SV　and　P　waves　input　are　considered　herein　for　a　2D　jointed　rock　slope.　For　the　jointed　rock　mass,　the　jointed　material　model　in　ABAQUS　software　is　employed　to　simulate　its　behavior　as　a　continuum.　Results　of　the　study　show　that　the　earthquake　incident　angles　have　significance　on　the　seismic　stability　of　jointed　rock　slopes.　The　larger　the　incident　angle,　the　greater　the　risk　of　slope　instability.　Furthermore,　the　stability　of　the　jointed　rock　slopes　also　is　affected　by　wave　types　of　earthquakes　heavily.　P　waves　induce　weaker　responses　and　SV　waves　are　shown　to　be　more　critical.