Abstract: In order to analyze any section shape of reconstructed model and observe inner structure in the visualization of ICT slice reconstructed model, the reconstructed model is cut by the plane. A method is put forward to cutting. First cutting is done by the cutting plane to the cube image space in which reconstructed model is, intersection point set is formed, then the spacial cutting plane is mapped to 2D image plane, finally grey value of the spacial cutting plane image is calculated and the section image is got. Inner structure and shape are observed by the section image. It will establish the base for nondestructive testing.