In this paper, the sufficient precooling of superconducting magnets of MRI facility in LN 2 and daining methods of LN 2 before LHe transportation are described.

• 介绍了核磁共振成像设备中超导磁体在液氦输送前，磁体在液氮中进行充分预冷以及液氮的排出方法。