The method of determining price is as follows : 1 ) for " oil pipelines " , that is pipelines that built depending on state finance appropriated money or enterprise modification fund in the past , the fixed price will be based on social average cost profit margin 二、天然气管线运价采用“老线老价、新线新价、一线一价” 。确定价格的方法为: 1对“老管线”即过去用国家财政拨款或企业更改基金建设的管线,按社会平均成本利润率定价。