We propose a new method to fabricate a photorefractive Dammann grating in this pa- per. Dammann grating is fabricated by photorefractive effect in LiNbO3:Fe crystal using imaging method. The photorefractive Dammann grating has not only the advantage of a conventional Dammmann grating, moreover, the method is real time and very simple, and the crystal can be used recycled. This method can be widely used in optical information processing and integrated optics.