Abstract: A reason analysis of accident has been made on some crossover structure. The scenario tc solve the problem is that adopting the SAP90, the finitive element program, calculates the combination loading (wind, water, snow, temperature, and internal pressure loading) of crossover structure of the pipeline, and in the calculating model, the pipe is simulated with pipe unite, other components are simulated with space beam. The result shows that the scenario is effective to solve the problem and avoid the future accident.