Abstract: The deformation of rocks at the nonlinear compaction phase varies significantly under the action of complex environments. In order to better describe the various stages of deformation and damage characteristics of the loaded rock in the cold zone rock engineering, the change rules of axial strain difference and axial strain are analyzed during the rock compression process, and a method for determining the threshold point of rock stress is established. Based on the model for intergranular bond fracture to define various types of damage variables, the equations for damage evolution under freeze-thaw-loading are derived segmentally with the void closure point as the boundary, and the deformation of the rock is regarded as the one consisting of the deformations of the void and the solid particles, so as to establish a constitutive model for damage of freeze-thawed rock with the consideration of the void compaction characteristics. To verify the rationality of the model, the uniaxial compression tests on sandstone under FT cycles are conducted, the deformation characteristics and damage evolution pattern of rocks under freeze-thaw (FT) cycles are analyzed. The results show that the theoretical curves of the constitutive equation are in good agreement with the experimental ones, which reflect the whole process of deformation and failure of rock under freeze-thaw loading, and can characterize the influences of FT cycles and pore compaction on the deformation characteristics of rock.