本文在作者1978年提出的《一个新的实际气体通用状态方程》的基础上,进一步考虑到饱和蒸汽中出现多重复合分子(双分子、三分子、四分子、……)的可能性,得出了一个饱和蒸汽的对比状态方程.它具有通用、精确、形式简单、所需经验常数很少(主要是临界参数)、适用参数范围宽广、物理概念清楚等特点. On the basis of “a new common equation of actual gas” proposed by the author in 1978, the possibility of multiple compound molecules (bimolecules, three molecules, four molecules, ...) in saturated steam is further taken into account. A comparative equation of state for saturated steam has the characteristics of universal, exact, simple form, little empirical constants (mainly critical parameters), wide range of applicable parameters and clear physical concept.