Abstract: PMN-PT series ferroelectric single crystal have great application prospects in the field of ultrasonic transducers due to its excellent piezoelectricity and high electromechanical coupling coefficient. In recent years, some research teams in China have made breakthrough achievements in the theoretical research, crystal growth, and device design of ferroelectric single crystals, which gives a solid support to the commercialization of ferroelectric single crystals in the medical ultrasound applications. In this article, the recent research progress on ferroelectric single crystals and its application progress in the medical ultrasound transducers are introduced, and the industrialization of ferroelectric single crystal transducers by domestic ultrasound companies is summarized.