The therapeutic indications of radioactive particle implantation are broad, applicable to those who cannot be operated, relapsed after radiotherapy, and tumors with low sensitivity to radioactivity, with the following specific scope of application: 1, head and neck tumors: including tongue cancer, thyroid cancer, metastatic cancer of lymph nodes in the neck; 2, chest tumors: commonly used in clinical practice for lung cancer, such as peripheral lung cancer that cannot be removed by surgery or relapsed after radiotherapy, can be well controlled by inter-tissue implantation of radioactive particles. treatment can be well controlled; 3. abdominal tumors: liver cancer and retroperitoneal metastases have achieved good treatment effect. For some pancreatic cancers that cannot be removed by surgery, radioactive particle implantation can be performed under intraoperative ultrasound guidance to control tumor progression and relieve cancer pain.