Abstract: The Dynamic Infrared Scene Projector based on Digital Micromirror Device (DMD) can be used in Scene Simulation System. The principle of displaying grayscale images on DMD which used in Scene Simulation System and its driving timing were discussed in this paper. An infrared scene projector based on 0.7XGA DMD chipset of Texas Instruments was designed. This projector can be synchronized by external trigger signal, and its max frame rate is greater than 250 Hz while the image mode is 8 bits of grayscale resolution. The synchronization between the projector and the image sampling equipment (Infrared Thermal Imager) has great influence on the sampled result. 3 kinds of synchronization relationship, including the projecting phase leading, equal to and lagging the image sampling system, were analyzed to illustrate the influence of the synchronization relationship between the projector and the image sampling equipment. Experiments show the results in detail.