Abstract：A fine-grained clay was compacted in the laboratory and was thereafter exposed to a maximum of 21 closed-system freezing and thawing cycles. The sample height，water content，stress-strain behavior，failure strength，elastic modulus，cohesion and internal friction angle were measured in unfrozen soil as well as in thawed soil. The results show that the physio-mechanical characteristic of investigated soils changed after freezing and thawing. The height of studied sample increased and water content decreased before 7 freezing and thawing cycles and kept invariable after 7 freezing-thawing. The curves style of stress-strain behavior were not be affected by freeze-thaw process；but the elastic modulus and failure strength were heavily influenced by the number of freeze-thaw cycles. For the soil investigated，the cohesion decreased with increasing of the number of freeze-thaw cycles；and the internal friction angle ranged from 15°to 30°.
