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用三次样条函数描述石油馏分实沸点蒸馏曲线，将连续热力学方法引入石油馏分饱和蒸气压的AP计算式，其结果经大庆、胜利和新疆等原油馏分饱和蒸气压试验数据的检验，优于经典的虚拟组分法。
The cubic spline function is used to describe the distillation curve of the solid boiling point of the oil fraction. The continuous thermodynamic method is introduced into the AP calculation formula of the saturated vapor pressure of the petroleum fraction. The result is verified by the saturated vapor pressure test data of crude oil fractions such as Daqing, Shengli and Xinjiang, The virtual component method.