Abstract: Through experimental investigation,we put forward a method of scratching hologram by which great＂three-dimensional＂images can be made; also analyzed the imaging principle of scratching hologram qualitatively and gave the quantitative theoretical explanation based on the law of reflection. Finally we got the curve consistent with the experimental results by means of numerical simulation so as to visualize the result of theory,and then the＂image deformation＂,and position of images were discussed,and proved that the stereo sense of the scratching holographic is not derived from binocular stereoscopic vision principle.

Key words: hologram, scratching holography, illegal hologram, geometrical optics