The characteristics of the dynamic infrared (IR) scene simulation technology based on digital micro-mirror device (DMD) include large dynamic range, high spatial resolution, high frame rate, good uniformity, small volume and so on. It can simulate infrared scene in the laboratory, reduce the research cost of the infrared system and shorten the development cycle. According to the requirements of the infrared scene simulation system based on DMD, the characteristics of the infrared projection optical systems are analyzed, and the technical indices of the projection system are determined. The selection of initial structure is presented. The infrared projection system of high image quality and high performance-price ratio is designed for the wave band of 8~12 μm based on the aberration balance theory and aspherical technology. This system for DLP5500 DMD (1024 pixel×768 pixel) is composed of three refractive lenses. The focal length is 200 mm and the relative aperture is 13. The optical system image quality is evaluated with Zemax optical design software. The result shows that modulation transfer function (MTF) of the system is close to the diffraction limited curve. The spot diagram root mean square (RMS) value of each field of view is smaller than the radius of Airy disk. The system meets the requirements of technical specification.