Abstract: The computer simulation technology has been widely used in the pipeline design, operating management and staffs training in the pipeline industry. The simulating software of pipeline provides a powerful tool for the dynamic analysis of hydraulic characteristics and the determination of operating plan, as well as the detection and analysis of pipeline leakage. In the on-line (real time simulation) and off-line simulation, the development and application in the simulation technology of foreign pipelines are respectively introduced, and especially the models'functions of on-line simulation softwares and relationships between them.