In the evaluation and testing of the hardware-in-the-loop simulation and IR imaging systems, the dynamic IR scene projection is the key technology. With the successful development of the digital micromirror devices(DMD), close attention is paid to the dynamic infrared scene generation utilizing DMD. The application of dynamic IR scene projection to the simulation and testing of the IR imaging system are presented. The working principle of DMD is specified, and further discussion is also given to the core technologies and state-of-the-art of the DMD dynamic IR scene projection.