Abstract: Moraine soils in the Tibetan Plateau region are prone to causing geological disasters and threatening engineering construction under the influence of freezing and thawing. Therefore, this paper conducts triaxial compression tests and employs the Duncan-Zhang and modified Duncan-Zhang models to study the mechanical properties and strength deterioration of moraine soils. The results show that: (1)under high confining pressure, the specimen after freezing and thawing exhibits a more pronounced strain-softening phenomenon; (2)the number of freezing and thawing cycles has no significant correlation with the friction angle in the soil body, and the cohesion follows a negative exponential function of attenuation; (3)the Duncan-Zhang model is utilized to predict the stress-strain curve of moraine soils under freezing and thawing, and the simulation accuracy is higher under low confining pressure. The model parameters and the number of freezing and thawing cycles exhibit a negative exponential function relationship; (4)the modified Duncan-Zhang model can be employed to adjust the Duncan-Zhang model. The modified Duncan-Zhang model better reflects the strain-softening characteristics of the specimen. However, for the residual strength stage after the destruction of the specimen, the theoretical value significantly differs from the experimental results, and the reliability is low. This study aims to provide a fundamental reference for engineering construction in cold regions.