Abstract: The structural model and classification of themagnetic fluid (MF) were briefly introduced at first in this paper. And then the principles and applications of the MF seal, MFlubrication, MF polishing, thermal conduction with MF, transducer techniqueusing MF, magnetic separation, MF printing, MF damper, MF micropump, MF filmand applications in the medical field were reviewed. In the end, someprospective research work for the magnetic fluid technique was putforward .