On March 23, the start-up meeting of terahertz 3D tomograph project, a national major instrument and equipment development project, was successfully held in Xi'an. Zhuang Songlin, academician of Shanghai University for Science and Technology, Li Yan, Department of Science and Technology of Shanxi Province attended the conference upon invitation. Professor Lei Zhenlin of Shenyang Scientific Instrument Research Center Co., Ltd., Chinese Academy of Sciences, Professor Yang Zhijun of Chinese Academy of Metrology, Professor Jiang Wanshun of the 41st Research Institute of China Electronic Technology Group, Professor Zhu Yiming of Shanghai University of Technology and Professor Hu Min of University of Electronic Technology attended the meeting as technical experts. Zhang Baifeng, general manager of Xi'an North Photoelectric Technology Defense Co., Ltd., Cao Shuangxi, deputy general manager, Zhang Le, associate professor of China University of Metrology, and Rong Baoping, general manager of Huataiji Photoelectric Technology Co., Ltd., attended the meeting. Cao Shuangxi, deputy general manager of Xi'an North Photoelectric Technology Defense Co., Ltd., presided over the start-up meeting.