为了揭示水泥基粉土泡沫轻质土耐久性能，通过调整轻质土湿密度、粉土掺量等指标，研究了50次干湿循环过程中泡沫轻质土无侧限抗压强度的变化规律。结果表明，随着干湿循环次数的增多，泡沫轻质土的基本力学性能仅略有衰减，对于整体强度未产生显著影响，显示了良好的抗干湿循环特性。依据试验结果，建立了适用于不同配比的水泥基粉土泡沫轻质土无侧限抗压强度随干湿循环次数的数学预测公式。研究成果可为该材料的工程应用提供科学依据。 To reveal the durability of silt-based foamed concrete, the variation law of unconfined compressive strength during 50 dry-wet cycles was studied by adjusting the wet density and silt content. The results show that the basic mechanical properties of silt-based foamed concrete only decreased slightly with the increasing dry-wet cycles. But dry-wet cycles had no significant effect on the overall strength. The silt-based foamed concrete showed a good resistance to dry-wet cycles. According to the test results, a mathematical formula for predicting the unconfined compressive strength of silt-based foamed concrete with different proportions as a function of the number of dry-wet cycles was established. The research results can provide scientific basis for the engineering application of this material.