Aiming at the problem of inaccurate temperature measurement of the common infrared thermal imager caused by the thermal radiation of the surrounding high temperature objects, according to the principle of the temperature measurement and the infrared thermal radiation theory, a high temperature compensation measurement method based on this type of infrared thermal imager is designed. Shielding materials with emissivity of 0.5 can fully compensate the effect of the high temperature radiation. When the emissivity is equal to 1, it is equivalent to ignoring the thermal radiation of the high temperature object, which does not play a compensating role. The higher the emissivity is above 0.5, the higher the measured temperature is than the real temperature； and the more 0.5 exceeds the emissivity, the higher the real temperature is than the measured temperature.