从理论上阐明了计量置换平衡常数的对数ｌｏｇＫ．对液相色谱（ＬＣ）中计量置换保留模型的线性参数ｌｏｇＩ起着主导作用。ｌｏｇＩ表示溶质对固定相的亲合势，且具有热力学平衡常数的性质。指出ｌｏｇＩ作为ＬＣ中对非极性小分子溶质、固定相和流动相性质的表征参数的可能性，并用非极性小分子溶质对上述的预计进行了检验，符合程度甚佳。还发现ｌｏｇＩ与绝对温度倒数有线性关系。 The logarithm log K of the equilibrium constant of measurement and replacement is theoretically expounded. The linear parameter logI of the metered displacement retention model in liquid chromatography (LC) plays a dominant role. logI represents the affinity of the solute to the stationary phase and has the property of a thermodynamic equilibrium constant. It is pointed out that the logI as a LC characterizes the characterization of the non-polar small molecule solute, stationary phase, and mobile phase properties, and the non-polar small molecule solute was used to test the above predictions to a good degree. It has also been found that logI has a linear relationship with the reciprocal of absolute temperature.