The importance of hard-ware-in-the-loop infrared seekers testing with realistic infrared scenes warrants a review of the current technologies used in dynamic infrared scene simulation. Infrared seeker dynamic scene simulation technology includes dynamic infrared simulator technology and infrared scene image generation technology. Infrared simulator includes resistor arrays, liquid crystal light valves, laser writers, laser diode arrays, CRT and digital mirror devices (DMD). The technology that may provide high performance for testing seekers is the DMD approach. Other technologies such as resistor arrays, LCLVs, laser diodes, and the CRTs are still under development. Infrared scene generation can be divided into the stage of data generation and the stage of programming. Target 3D model is completed by the software of Multigen Creator and dynamic scene image generation is completed by the software of Vega. The SensorVision module of Vega can supply the atmosphere model parameter and target texture material.