A hydraulic servo testing system was adopted to study the anti-frost property of concrete with four different kinds of dosage of fly ash.Freezing-thawing cycles were conducted on the concrete with different dosage of fly ash,after that uniaxial compressive tests were performed and the change of the concrete mass was measured.The freezing-thawing damage evolution equation of concrete was analyzed.The results show that the anti-frost property and anti-cracking ability of concrete can be improved when a certain amount of fly ash is added.Moreover by defining a damage variable,the damage degree of concrete with different volume of polypropylene fibers at different temperature was analyzed quantitatively.The freezing-thawing damage constitutive relation of concrete obtained in the paper provides some experimental and theoretical bases for the future study on freezing life of fly ash concrete.In addition,the late strength of concrete with fly ash is stronger than that of the ordinary concrete,which has a certain reference value for the concrete application at low temperature in actual projects.