For the increasing of infrared system’s complexity,it’s a costly,even impossible thing to test various performances of infrared systems in field. Fortunately,there is an economical and practical way to test those indexes by using infrared image simulator. An 8bit gray-scale infrared image player based on DMD is designed,functions of every model are elaborated in detail,and related performance indexes of the system are tested by using thermal infrared imager designed by the lab. According to the tests,its linear correlation is 0.99997,the non-uniformity of image is better than 1.7% (including thermal imager),and the image frame rate of it is up to 252.5 f/s. It can meet the needs of most simulation and tests for infrared imaging systems.