Abstract: Floating-zone crystal growth is one of the most important methods of growing bulk single crystals. In this paper, the qualitative and quantitative studies on the effect of macroscopic fields in the melt zone on the dopant distribution of the crystals were reviewed, both theoretically and experimentally. From the viewpoint of improving the dopant distribution uniformity in the bulk single crystal, the application of two important, popular technologies, microgravity environment and externally applied mag...