The tomography method with scattering light is that a crystal is scanned with a beam of light. Meanwhile

like a X-ray topograph

the topograph of scanning light from the crystal is taken with a camera. Through the scanning topograph

the imperfections and the Characteristics of the crystal can be known. This method can be used as nondestructive three-dimensional analysis of imperfections. As long as the crystal is transparent to the scanning wave-length

the crystal imperfections can be observed by this method. The method is excellent

especislly for the crystals which have large X-ray mass-absorbing coefficients as fine-made slice used in X-ray observation is unnecessary. This method can also be used to test diamond

jewel and so on nondestructively. In this paper

the principle and experiment about the tomography method are introduced.