Abstract: The operating pressure of oil and gas transportation pipelines is a major part in design, which will impact on the tech-economic target and it is very important to determinate it. This paper lists the main technical parameters of land oil and gas pipelines in the world, further describes the characteristics of operating pressure of oil and gas pipelines, and considers that the operating pressure of pipeline is a decisive factor of construction cost of pipeline, and generally the operating pressure of oil pipeline is not too high, for the gas transmission pipeline, the optimum operating pressure is tending to high and is relative to the construction cost of pipeline and gas transmission managing cost.