Infrared thermal imager has been widely used in the field of ammunition damage performance evaluation.Aiming at the situation that there are few articles on the accuracy correction of thermal damage assessment based on infrared thermal imager in China,part of the error sources of assessment are analyzed,and the corresponding error compensation ideas are put forward.Based on the theoretical analysis of the error source of thermal damage measurement test,the temperature error caused by ranging and atmospheric transmission is corrected.By locating the detonation center and setting up the marker rod,the possible errors in the measurement process were eliminated.Finally,the blind element correction and image enhancement processing are carried out for the infrared image of the fireball,which improves the identification degree of the image and improves the accuracy of locating the damage range of the fireball.