Abstract: In the temperature measurement technology of radiation, due to the nonlinear effect characteristics of infrared detector, cause the error of target infrared radiation measurement. It propose on the basis of the blackbody radiation law, Firstly, through the theoretical calculation of thermal radiation quantity curve of blackbody at different temperatures under certain wavelength bandwidth, Then, through measuring the amount of heat radiation of infrared detector in the same wavelength bandwidth detected under the same temperature, Last，correcting the detection curve on the detector by using the theoretical curve, In order to achieve the nonlinear effect on detector correction, to improve the measurement accuracy of thermal radiation thermometry.