法拉第效应是把光、电、磁等物理量紧密联系的一种磁光效应，基于法拉第效应的磁光调制技术更是因其抗干扰性强、精度高、体积小、重量轻等特点，得到广泛应用。在梳理磁光调制技术文献基础上，介绍了磁光调制技术的基本原理，详细阐述了国内外磁光调制技术在方位基准传递、精密测角、材料性能研究、工业参量测量、生物化学等领域的应用，重点分析了磁光调制中精度优化和可靠性提升的关键技术研究，并探讨了该技术未来的研究热点。

Faraday effect is a magneto-optic effect which closely linkes physical quantities such as light, electricity and magnetic. Magneto-optic modulation technique based on Faraday effect is widely used because of strong antijamming, high precision, small volume, light weight, etc. On the basis of a summary of magneto-optic modulation technology literature, the basic principle of magneto-optic modulation technology is introduced. The applications of magneto-optic modulation technology in the fields of azimuth benchmark transfer, precision angle measurement, material performance research, industrial parameter measurement, biochemistry, etc are introduced at home and abroad in detail. Key technologies of precision optimization and reliability improvement in magneto-optic modulation are emphatically analyzed. Finally, the future research hot spot in this technology is discussed.