Considering the super spatial-light-modulation feature, the application and related technologies of digital micromirror device (DMD) in photoelectric equipments are analyzed in detail. Based on analyzing the relationship between maximum frame frequency that could be realized，systemic architecture, gray-scale level and the type of DMD, the project with several DMDs in series to achieve high gray-scale level is given. The realizations of DMD′s spatial modulation feature used to enhance system performance are discussed. DMD can be used for high dynamic range imaging, intra-pixel target feature detection, superresolution of detector pixel, compressive sensing and imaging spectrometer. Also, the key technologies in the application are given, including time of exposure determination for every pixel in high dynamic range imaging, geometrical alignment between micromirror in DMD and detector pixel, relative motion between target and detector on motorial platform and the effect of DMD micromirror fill factor on system performance. The programming imaging system with DMD, which allows greater control over the orientations of individual mirrors and has higher updating frequency of memory, is regarded as the new trend.