The High Energy Photon Source(HEPS), Institute of High Energy Physics is honored to announce that the 12th International Conference on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI2023) will take place in Beijing, China, from 6 to 10 November 2023. The conference aims to enable collaboration on cutting-edge instrumentation and technology, as well as novel research and development, that drives the rapid advancement in the field of synchrotron radiation and free-electron laser light sources worldwide.