To improve the spatial light modulation properties of Digital Micromirror Device (DMD),and exert its performance in holographic display and threedimensional reconstruction,blazing characteristics of DMD was investigated.Wtith the theory of reflection grating and DMD microstructur,it was concluded that there were four relative blazing states of DMD according to theoretical calculations and experimental results.And it was drawn that incident angle of 24° as usually demanded was the least angle of blazing angles.Thus the incident angle could be adjusted properly to change the blazing states of DMD and enhance the visual effects of the holographic representation.Finally,Fourier transform holography display was investigated as an application example,and the experimental results agree well with the theoretical analysis.