<正>In 2005, the commissioning totally 60 days for the CSR main ring was performed, the first-turn and stored C6+ beam (with lifetime more than 10 s) in the CSRm were achieved with≈7 MeV/u 12C4+ as the injection beam. Many technical progresses have been made before realizing the storage of ion beam, such as the control of magnet power supplies, the improve-