Abstract: The analytical model is established for the pipeline crossover section supported with diagonal rope in accordance with structure mechanics and a numerical method is suggested for the nonlinear structure behavior of diagonal rope. Combined with FEM, the analytical program of the whole structure has been made. First, the structure displacements and stresses are calculated for the crossover section under various loads caused by different transportation processes with the program; then, the correspondent criterion specified by design codes are used to check the structure's safety. The results show that the buckling of pipe wall are possibly caused by the changes of temperature and internal pressure after the alternative transportation processes are applied to the pipeline as well as by the axial displacements of anchor blocks due to temperature rising.