Freeze-thaw cycle test is carried out using sandstone taken from a tunnel in Altay. The sandstone specimen are frozen for 9 hours at minus 25 degrees,and melted for 5 hours at (20±2)degrees,which is the process of a freeze-thaw cycle. We take seperately this kind of cycle for 0,5,10,20,30,40,50,60,80 times for the rock samples. Then by taking the uniaxial compression test and the scanning electron microscopy,we obtain saturated sandstone's failure character、stress-stain curve、elastic module、poisson ratio under different times of freeze-thaw cycle,and analyze the physical and mechanical properties、the relationship between the fracture micro crack evolution and the times of freeze-thaw cycle. It turns out that with the increasing time of the cycle,the elastic module of the sandstone samples decrease on different extends,the peak stain becomes increasingly large,while the Poisson ratio increases firstly and then decreases,the area、length and width of micro crack increase on different extends,and the damage and failure of sandstone is continuously accelerating.