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The performance testing of infrared imaging system is an important guarantee for product quality. This paper introduces the design of testing equipment of an infrared imaging system, By designing infrared target images with certain characteristics, the imaging function of the infrared imaging system can be detected. At the same time, the key indexes such as resolution and bad image elements of the infrared imaging system can be detected ,and the transmission of the testing system can be guaranteed through the control design of the testing system. The temperature range and quality of the infrared image can meet the requirements of the object under test, and can provide a set image to achieve.The temperature resolution of the detection system is not more than 0.2 degrees,the relative distortion of the image is 2%, the moving accuracy of the target is not more than 0.05 degrees, the non-uniformity of the light distribution is not more than 10%, and the field of view angle is not less than 8 degrees.