Radioactive particle implantation for tumor treatment refers to the implantation of sealed radioactive nuclide inside or around the target tumor tissue through imaging-guided technology with a puncture needle or through direct surgery, where the radioactive nuclide continuously releases rays to kill tumor cells and achieve the purpose of tumor treatment. The radioactive particles are usually iodine-125 isotope particles, which can effectively control the continued spread of many common malignant tumors. It is suitable for advanced malignant tumors that are inoperable, inoperable for intervention or accompanied by lymph node metastasis, such as mediastinal, paratracheal, axillary and subclavian lymph nodes metastasis. It can be used for prostate cancer, brain tumor, lung cancer, head and neck tumor, pancreatic cancer, liver cancer, kidney and adrenal tumor, etc. The spatial distribution of particles is important in radioactive particle therapy. If the spatial distribution is too sparse to reach the treatment volume, and if it is too dense, more particles are needed, adding a certain amount of waste. In addition, after the tumor disappears, if a large amount of radioactive dose remains, it will cause damage to the adjacent tissues. Therefore, when implanting radioactive particles, it is necessary to ensure not only the overall treatment volume but also the uniform division of the area.