The infrared radiation calibration method was introduced,the field calibration of infrared warning equipment was carried out by short-range direct extended source method and long-distance small source method,and the verification and error analysis were carried out.The results show that the relative calibration errors of the short-range direct extended source method is between 5.67％to 15.73％at the temperature range of 10 ℃～50 ℃.The relative calibration errors of the long-distance small source method at 37 m ranging from 1.38％to 5.72％,and those at 63 m ranging from 10.34％to 29.66％,indicating that the long-distance small source method at an appropriate distance is an effective method for field calibration of infrared warning equipment operating in the mode of circular scanning.
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