Radioactive particle implantation is a treatment method of brachytherapy, which is called radioactive particle inter-tissue implantation. In the 1970s, radioactive particles were implanted into prostate cancer lesions in the United States and achieved better therapeutic effects. The country started to carry out radioactive particle implantation in the 1980s, and radioactive particle implantation has been greatly developed in the past 10 years. The iodine-125 particles and palladium-103 particles, which are equivalent to a small radioactive source with a length of 1 cm and a diameter of 0.5 cm, are commonly used in clinical practice, and the radioactive particles are inserted directly into the lesion under the guidance of CT and ultrasound to play the role of proximity radiotherapy, so that the radiation dose received in the lesion is large while the dose received by the surrounding normal tissues is small, achieving the purpose of highly conformal radiotherapy with good efficacy.