According to the application requirements of the dynamic infrared scene simulator, a projection optical sys-tem of coaxial dual-band infrared (middle wavelength 3~5μm and long wavelength 8~12μm) scene simulator is de-signed in this paper. The structure is simple, composed of only four pieces of spherical lens and one projection prism. Ge、ZnS and ZnSe are used to achieve the dual-band infrared achromatism. At the cut-off frequency 17 lp/mm and the image distance 5.1mm, the MTF of middle wavelength is greater than 0.7; the MTF of long wavelength is greater than 0.4. The result shows that the MTF of the system is close to the diffraction limited curve and the image quality is perfect. The system meets the requirements of the overall design of the infrared scene simulator.%本文针对动态红外景象模拟的应用需求，设计了基于数字微镜器件（DMD）的共轴红外双波段（中波3~5μm和长波8~12μm）景象模拟投影光学系统。该系统结构简单，仅由4片球面透镜和1个投影棱镜组成，使用Ge、ZnS和ZnSe三种普通红外材料校正红外双波段色差。在截止频率17lp/mm、像距5.1mm时，红外中波的调制传递函数（MTF）大于0.7；红外长波MTF大于0.4，接近衍射极限，像质优良，满足红外景象模拟器的总体设计要求。
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