The International Conference on Magnet Technology (MT) is the most important conference for scientists and engineers to report and discuss the latest progress in every aspect of the science, technology and applications of magnets. MT-21, the 21st conference of this biennial series, will take place in Hefei, Anhui, China, during October 18 to 23, 2009, hosted by Institute of Electrical Engineering and Institute of Plasma Physics, Chinese Academy of Sciences.