根据国内外许多钾盐矿床大量样品测定的结果，通常石盐（岩）的３７Ｃｌ／３５Ｃｌ比值和δ３７Ｃｌ值高于钾石盐（岩），而钾石盐（岩）又高于光卤石（岩），说明这些蒸发岩是在不同水体、不同浓缩阶段形成的，是氯同位素分馏作用长期进行的结果。这些蒸发岩的氯同位素组成与其Ｂｒ、Ｋ、Ｍｇ含量变化有密切关系。今后在我国找钾过程中，应把氯同位素组成及其Ｂｒ、Ｋ、Ｍｇ含量结合起来，作为找钾标志考虑。 According to the results of a large number of samples from many domestic and overseas potash deposits, the 37Cl / 35Cl ratio and δ37Cl value of rock salt are generally higher than that of potash stone (rock), while that of potash stone (rock) is higher than that of carnallite , Indicating that these evaporites are formed in different water bodies and in different enrichment stages and are the result of long-term performance of fractionation of chlorine isotopes. The chlorine isotope compositions of these evaporites are closely related to the changes of their contents of Br, K and Mg. In the process of looking for potassium in our country in the future, we should combine the composition of chlorine isotopes and their contents of Br, K and Mg and consider them as signs of potassium.