In an infrared scene simulation system based on a Digital Micromirror Device (DMD), digital infrared scene signals are required to be used as the input source for modulating and controlling the DMD. To meet this requirement, a general digital infrared scene generation method is proposed. Firstly, the process of infrared scene simulation based on Vega by a computer is presented. Then, the design process of developing an infrared scene driving program and a scene format conversion program is described in detail. The method not only can convert the Vega infrared scenes into the static infrared images in BMP format and the dynamic infrared video in AVI format, but also can improve the reuse and portability of infrared scenes. Therefore, it is of great practical value to engineering applications.