Ultrasound knife, or high-energy focused ultrasound (HIFU, abbreviated as Hai Fu Knife in Chinese). It is an organic combination of the most advanced high-tech achievements in the world today. In order to further improve the rich treatment means and improve the level of medical services, our department has newly introduced the FEP-BY02 type high-energy focused ultrasound therapy instrument produced by Beijing Yuande Biomedical Engineering Co. At the same time, the cavitation effect, mechanical effect and other biological effects of ultrasound can completely kill the diseased tissue without damaging the normal tissue outside the treatment area.