A damage constitutive equation was established based on Maxwell model.The indirect tensile (IDT)strength was ap-plied as the damage variable to characterize the freezing-thawing damage progress.Result shows that the IDT strength of asphalt mixture at low temperature decreased with the increasing cycles of freezing-thawing.The progress of the freezing-thawing damage can be divided into three damage phases,including rapid damage phase,stable damage phase and developing damage phase.The air void percentage of the asphalt mixture has great influence on freezing-thawing damage.The stable value of porous asphalt mix-ture cleavage strength ratio was around 40%,and the ratio of asphalt concrete IDT strength was around 70%.After 4-8 freezing and thawing cycles,the freezing-thawing damage develops into stable damage phase.%基于Maxwell模型建立了沥青混合料冻融损伤本构方程，以冻融后的劈裂强度作为损伤变量，分析沥青混合料的冻融损伤过程。分析表明，沥青混合料的低温劈裂强度随着冻融循环次数的增加而减小。冻融损伤过程大致分为快速损伤期、稳定损伤期及损伤发展期3个阶段。空隙率大小对沥青混合料的冻融损伤有较大影响。多孔沥青混合料劈裂强度比稳定值约为40％，沥青混凝土劈裂强度比约为70％，在4～8个冻融循环之后达到冻融损伤稳定期。
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