Abstract: Simplifying the tunnel across the landside deformation zone as an elastic foundation beam, large bend? ing deformation may occur when a tunnel section in a landslide area is long. Being a special full-buried elastic foundation beam, it′s necessary to study the effect of tangential friction resistance. A calculation model of elastic foundation beam considering the effects of tangential friction resistance is established, a gradual revision concept is introduced, a formula for calculation of the internal force and displacement is set up with the transfer matrix method, and a corresponding calculation procedure is programmed. The calculation results show the scope of the effects of the tangential friction resistance on the tunnel mainly concentrates in the area near the boundary of the landslide, and the tunnel′s internal force and displacement both decrease to some extent due to tangential friction resistance; the effect of the tangential friction resistance coefficient on the tunnel′s internal force and displacement in the landslide area is relatively small, while the effect is relatively large outside of the landslide area.