The change of soil strength and deformation parameters caused by the freeze thaw cycle is one of the important issues with engineering works in the cold area. In order to investigate the change of strength and deformation parameters, with the saturated silty clay samples taken after and before the freeze thaw cycle as the research object, the triaxial shear test after consolidation and drainage, triaxial isotropic compression test and elastic modulus test were carried out to analyze the effects of freeze thaw cycles on soil strength and deformation parameters . The research results can be used as reference for the treatment of frost damage in engineering works and also as testing data for numerical simulation.