Abstract: In order to explore the impact of different cooling conditions on the mechanical properties and damage evolution of concrete after high temperature treatment, the wave velocity and uniaxial strength of concrete specimens were measured by sonic instrument and a mechanical testing system.According to the results, the concrete strength deteriorated the most under half water-cooling condition compared with other cooling conditions.Meanwhile, the analysis on Poisson's ratio and elastic modulus of concrete specimens showed that the half water-cooling condition had the great impact on concrete bearing capacity and crisped the concrete.Under the three cooling conditions of natural cooling, full water-cooling and half water-cooling, the test wave velocities of concrete samples were 2.56,2.57 km/s and 2.42 km/s, and test damage coefficients were 0.480,0.476 and 0.534 respectively, which showed that the half water-cooling damaged the concrete most after the high temperature treatment.The conclusions can be applied to the design and maintenance of concrete structure after high temperature.