A fire simulated experiment were conducted on two types of concrete(C60 and C70). The damage of concrete was assessed by infrared thermography and ultrasonic rebound methods to verify the feasibility and characteristics of these two methods. The results show that the maximum temperature that the concrete experienced has strong correlation with the residual strength. Therefore, the maximum fire temperature can be used as an indicator to determine the concrete damage degree. On the other hand, the average temperature increase of concrete surface measured by infrared thermography has an excellent correlation with the maximum fire temperature. The average velocity of sound wave measured by ultrasonic rebound method as well as the rebound value with residual strength have good correlation with the maximum fire temperature. Due to the different indicators，these two methods are suitable for different situations.
