Infrared imaging jamming simulation target(JST) is used to provide interference source for IRIGS in the anti-jamming performance test of infrared imaging guidance system(IRIGS).at present,the digital simulation method is widely adopted,but it cannot simulate all kinds of interference sources accurately,because of the limitation of simulation accuracy.For this reason,a generation methods of the JST for IRIGS was proposed.But in the experiment,it is found that the emissivity error is introduced when using the traditional blackbody calibration method,and with the increase of operate time,the phenomenon of temperature drift occurs,it seriously affects the temperature inversion accuracy of thermal imager.In view of the above problems,a calibration method and a drift compensation algorithm for thermal imager based on target radiation element are proposed.The experimental result shows that This method can reduce thermal imager temperature inversion error from 7°C to 0.5°C.