Terahertz radiation can penetrate nonmetallic materials and nonpolar materials such as plastics,papers and cloth,and has lower photon energy than X-ray.Computed Tomography(CT) can obtain internal structure distribution information of a sample and reconstruct 3D images.THz CT has drawn much attention all over the world.In the paper,the research focuses and concrete conditions of THz CT in these years have been highlighted,and the problems and development trends have also been analyzed.The paper can provide technical reference for THz CT in China.