Finite element method is used for pipeline post-buckling analysis pipeline.Initial seometric imperfection is very important in pipeline global buckling.In order to reveal the effect of introducing method for building model on pre-buckling and post-buckling,FEM of pipeline exposed on seabed is built based on ANSYS;introducing method of initial seomeeric imperfection is presented and compared.Analysis shows that residual stress have obvious effect on critical temperature difference and maximum axial total str...