Buried oil and gas transmission pipeline engineering is a typical long-distance linear project,and landslide along the pipeline can cause threats and damage to its safe.The paper focuses on the large deformation response of pipelines in the landslide section,including perimeter.First,we construct the mechanical model of pipeline crossing lateral landslide.In the model,the factors,including landslide sliding,the angle between pipeline and landslide perimeter,the boundary conditions of the pipeline end,the interactions between pipe and soil are deeply considered.Then the key technologies of equivalent fault model and equivalent spring boundary are proposed and introduced.Based on the mechanical model and key technologies,a three-dimensional nonlinear finite-element model of buried pipeline crossing lateral landslide is established.In order to ensure the accuracy of the constructed model,case analysis and model verification is carried out.Next we finish a large number of numerical simulation studies,and possible failure modes of buried steel pipeline crossing transverse landslide body and sensitivity analysis of landslide characteristic parameters are deeply discussed.Calculation of pipeline inner force and distortion show that buried steel pipe will have failure modes such as tensile failure,buckling failure,lateral displacement and bending deformation.Maximum pipeline strain is positively correlated with landslide displacement and landslide angle,and it is not very sensitive to the change of landslide width.According to research findings,the angle between sliding direction of landslide perimeter and pipeline axis is an important influence factor.It is recommended to pay more attention to it and take it as 75°.In conclusion,this paper provides a finite-element analysis method for safe evaluation of pipeline under the lateral landslide,and gains a certain understanding of failure mode laws and large deformation influence mechanism of pipeline.