To study the influence of freeze-thaw cycles on the evolution of mechanical properties of steam-cured concrete， the freeze-thaw cycles test and uniaxial compression-acoustic emission test of steam-cured concrete specimens were carried out to analyze the damage characteristics of concrete under different steam-curing systems after the action of freeze-thaw cycles. According to the characteristic parameters of acoustic emission， a constitutive model of steam-cured concrete compression damage was established under freeze-thaw cycle， and the relationship between damage variables and the number of freeze-thaw cycles was discussed. The results show that steam-curing temperature of 60 ℃ and 80 ℃ is inconvenient for the frost resistance of concrete， and there is no significant difference between steam-cured concrete at 40 ℃ and standard-cured concrete in frost resistance. The change of the cumulative acoustic emission （AE） ringing count in the process of concrete compression failure shows obviously changes in three-stages， i.e.， in contact stage， quiet stage and spike stage. The demarcation point between quiet stage and spike stage shifts backward in time with increase of freeze-thaw cycles. In the early stage of the compression process， the damage of steam-cured concrete develops slowly. After the relative peak stress reaches 0.8， the damage of steam-cured concrete develops more rapidly until it fails under compression.