Taking the natural sulphate saline soil as the research object,the paper undertakes the indoor research on the soil under the freezing and thawing cycles,proves by the test result that the salt-frost heave increases along with the added times of freezing and thawing cycles and water con-tents;the differences in the salt-frost heave is slight with the increasing dry density in the circumstances of the same water content,so the water con-tent has more impact on the salt-frost;and the sulphate saline soil bears the maximal salt-frost heave volume in the third freezing and thawing cycle.%以天然硫酸盐渍土为研究对象，对天然硫酸盐渍土进行了室内研究，试验在冻融循环条件下进行，试验结果显示，天然硫酸盐渍土的盐-冻胀量随着冻融循环次数及含水率的增加而增大；相同含水率时，盐-冻胀量随干密度的增加盐-冻胀率相差并不大，含水率更能影响土样的盐-冻胀性；硫酸盐渍土在第3次冻融循环时表现出最大的盐-冻胀增量。
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