In　order　to　evaluate　and　predict　the　freeze-thaw　resistance　of　concrete　according　to　its　pore　structure,　the　freeze-thaw　resistance　and　pore　structure　of　concretes　with　different　mix　proportions　were　investigated　in　this　study.　The　fractal　theory　was　employed　to　characterize　the　pore　structure　of　concrete,　and　the　deterioration　of　pore　structure　due　to　the　effect　of　freezing　and　thawing　was　assessed　in　all　the　concrete　mixtures.　The　results　indicated　that:　first,　the　deteriorations　of　pore　structures　of　ordinary　concretes　were　worse　than　those　of　air-entrained　concretes;　second,　the　decrement　rate　of　fractal　dimension　of　pore　surface　is　effective　to　describe　the　deterioration　of　pore　structure　due　to　the　effect　of　freezing　and　thawing;　third,　an　evident　relationship　could　be　found　between　the　durability　factor　and　the　decrement　rate　of　fractal　dimension.　©　2013　American　Society　of　Civil　Engineers.