Infrared radiation characteristics are the important indexes of weaponry. Nowadays, the characteristics of weaponry are usually designed through theoretical calculation. Then, the static experiment is made on them in a wind tunnel. Finally, they are verified in the outdoor dynamic experiment. Compared with the design and the experiment made in a wind tunnel, the outdoor experiment may meet many complicated factors. Therefore, it is necessary to identify the accuracy of infrared measuring equipment used outdoors. The identification method of the outdoor calibration accuracy of infrared measuring equipment is described and the practical measurement results are given.