Abstract: The influence of mass loss,dynamic elastic modulus and mechanical properties of concrete in different solutions (Water,3.5wt% NaCl,Aircraft Deicing fluid) were studied through accelerated cyclic freeze-thaw tests,whose damage degree to concrete was also compared.The relationship between relative dynamic elastic modulus and relative residual compressive strength/relative residual flexural strength was analyzed.Meanwhile,the attenuation equation was also established on account of relative dynamic elastic modulus.The study shows that the freeze-thaw damage to the concrete in 3.5wt% NaCl solution is much worse than in the water,but its damage can be restrained in the Aircraft Deicing fluid.With the increase of the freeze-thaw testing times,the compressive strength,flexural strength and relative dynamic elastic modulus of concrete decrease.The loss ratio of the compressive strength and the flexural strength in different solutions ranges in a descendant sequence is from 3.5wt% NaCl solution to water and then to Aircraft Deicing fluid.The relative residual strength can be evaluated by the relative dynamic elastic modulus due to its good relativity to the relative residual compressive strength and relative residual flexural strength.