Photographic angular displacement measurement technology is an emerging technology which applying digital image processing technique for achieving fine photoelectric displacement measurement.It has been one of the hotspots in current study for achieving higher precision and higher resolution angular displacement measurement with small size disk compared with conventional encoder.In order to do in-depth research the photographic angular displacement measurement technology,the current photographic angular displacement measurement technology with image detectors was systemic analyzed in this paper.Moreover,the advantages and disadvantages of the current photographic angular displacement measurement technology were concluded.Finally,gave a perspective to the trend for the angular displacement measurement technology.