Experimental research was conducted on concrete torus-shaped specimens with different degrees of freeze-thaw damage. The results show that when the relative freeze-thaw depth is less than the threshold， the peak stress and peak strain of concrete exhibit linear degradation， while remained stable after exceeding the threshold. When the number of freeze-thaw cycle increases from 100 times to 200 times， the threshold of relative freeze-thaw depth increases from 0.5 to 0.8. Finally， based on the hypothesis of strain equivalence and statistical damage theory， the stress-strain relationship model of stressed concrete with different degrees of freeze-thaw damage is established.