Digital micromirror device (DMD) as an infrared scene generator, which has high frame rate, high spatial frequency, high grayscale, good uniformity and other advantages, is generally concerned in the study of target simulator for infrared imaging guided system. The principle of DMD is analyzed. The composition of target simulator for infrared imaging guided system is proposed. The simulation temperature achieves a high level above 400 ℃, and the grayscale could reach 214. Optical system and gray plate of the lighting system of the target simulator are designed.