Abstract: Infrared scene simulation systems based on computers are limited in input and output interface, which induces the weakness in real-time response and extendibility. The demonstration platform of real-time close-looped infrared scene simulation system based on embedded hardware was described. The parallel-calculation and multi-pipeline technology of this system were introduced. It combined several chips together to enhance its real-time calculation capability. The single-task environment enabled the simulation system to response real-time, which made the close-looped simulation possible. A self-design real-time rendering engine especially for infrared application was adopted to enhance the simulation precision. The realization and optimization process of this system were described, and the experimental result was given. The running time was controlled within 25 ms/frame with frame frequency of imaging system of 40 frame/s. All the results prove that it can reache design requirement.