The　distribution　of　landslides　induced　by　earthquakes　present　the　characteristic　of　＇back　slope＇　effects,　which　indicates　that　the　incident　direction　of　the　seismic　wave　greatly　influences　the　dynamic　response　and　instability　of　the　slope.　However,　the　study　of　slope　dynamic　response　under　oblique　incidence　is　not　sufficient.　Based　on　the　theory　of　elastic　wave　in　the　time　domain　and　viscous-elastic　artificial　boundary　conditions,　the　oblique　incidence　of　the　P　wave　is　realized　by　programming　with　Fish　language,　which　is　embedded　in　the　Fast　Lagrangian　Analysis　of　Continua　3D　(FLAC3D)　software.　The　accuracy　of　the　oblique　incidence　of　the　P　wave　method　is　verified　by　comparing　a　case　with　the　theoretical　solution.　The　dynamic　response　of　simple　harmonic　waves,　windowed　simple　harmonic　waves,　and　natural　seismic　waves　to　a　single　slope　excitation　is　studied.　Meanwhile,　taking　the　windowed　simple　harmonic　wave　as　an　example,　the　dynamic　response　characteristics　of　a　single　slope　(the　slope　height　is　90　m)　under　the　influence　of　input　wave　frequency　and　incident　angle　are　explored.　The　results　show　that　the　peak　acceleration　value　of　the　head　and　tail　of　the　slope　shoulder　under　the　action　of　the　harmonic　wave　is　more　than　1　times　that　of　the　middle　stable　section　as　the　impact　effect　of　the　non-zero　velocity　of　the　head　and　tail　of　the　input　wave.　The　acceleration　response　of　simple　harmonic　waves　and　windowed　simple　harmonic　waves　to　the　same　part　of　the　slope　surface　is　stronger　than　that　of　natural　seismic　waves.　Under　the　action　of　the　20°　incident　angle　of　the　windowed　harmonic　wave,　the　horizontal　acceleration　distribution　of　the　slope　changes　more　significantly　with　the　input　wave　frequency　than　the　vertical　direction.　When　the　input　wave　frequency　is　10　Hz,　the　peak　acceleration　of　the　slope　shoulder　position　reaches　the　maximum,　which　is　about　3.33　times　of　the　input　wave　amplitude.　At　this　time,　the　slope　height　is　consistent　with　the　critical　height　of　the　vertical　amplification　of　the　slope　dynamic　response.　The　change　of　vertical　acceleration　distribution　of　slope　is　higher　than　that　of　horizontal　direction　under　different　incident　angles　of　the　windowed　simple　harmonic　wave　with　a　frequency　of　2.5　Hz.　When　the　incident　angle　is　60°,　the　peak　acceleration　at　the　shoulder　position　reaches　the　maximum,　which　is　about　3.12　times　of　the　input　wave　amplitude.　The　research　shows　that　the　influence　of　seismic　waves　on　slope　dynamic　disturbance　will　be　underestimated　when　it　is　vertically　incident.　©　2024　Editorial　Office　of　Chinese　Journal　of　Geophysics.　All　rights　reserved.