On September 28, 2025, a groundbreaking achievement was made. The Institute of Plasma Physics under the Hefei Institutes of Physical Science at the Chinese Academy of Sciences, in collaboration with the Hefei International Applied Superconductivity Center, the Energy Research Institute of the Hefei Comprehensive National Science Center, and Tsinghua University, successfully developed a fully superconducting magnet. This magnet is capable of generating a steady - state high magnetic field of 351,000 Gauss. In terms of design, this magnet showcases remarkable innovation. It adopts a coaxial nested structure that ingeniously combines high - and low - temperature superconducting magnets. This structure effectively tackles challenges such as stress concentration that can occur under low - temperature and high - field conditions. During the testing phase, the magnet demonstrated outstanding performance. It operated stably for a continuous 30 minutes at the impressive magnetic field strength of 351,000 Gauss and was then safely demagnetized. The application of this magnet holds immense potential. It is set to propel the commercialization of high - end scientific instruments, with magnetic resonance imaging being a prime example. Moreover, it will offer crucial technological support for the industrialization of multiple fields, including nuclear fusion, aerospace electromagnetic propulsion, and superconducting maglev.