When　a　tunnel　crosses　a　landslide　orthogonally,　this　interaction　can　easily　lead　to　instability　in　both　the　landslide　and　tunnel　structures.　Based　on　the　relative　positional　relationship　between　a　landslide　and　a　tunnel,　we　studied　the　stress　mode　and　deformation　characteristics　of　the　tunnel　in　three　positional　relationships:　within　the　landslide　mass,　the　sliding　surface,　and　the　sliding　bed.　The　tunnel　is　a　typical　type　located　on　a　sliding　surface　at　an　engineering　site,　so　we　established　a　numerical　model　showing　the　intersection　of　the　tunnel　and　the　sliding　surface.　The　plastic　zone　distribution,　stress　characteristics,　and　displacement　distribution　characteristics　of　the　surrounding　rock　before　and　after　tunnel　excavation　were　studied.　Based　on　the　simulation　results,　we　analyzed　the　control　effect　of　anti-slide　piles　in　controlling　the　tunnel＇s　deformation　in　the　surrounding　rock　from　four　perspectives:　the　arrangement　of　anti-slide　piles,　the　spacing　between　piles　and　tunnels,　the　diameter　of　anti-slide　piles,　and　the　depth　of　piles　embedded　in　the　bedrock.　By　analyzing　the　deformation　law　of　the　landslide　mass　and　the　force　characteristics　of　the　tunnel　structure　under　the　orthogonal　conditions　of　a　tunnel　landslide,　we　provide　theoretical　guidance　for　the　adoption　of　anti-slide　piles　to　control　instability　in　tunnel　structures.