Proton heavy ion is a kind of radiotherapy and belongs to the more conventional photon radiotherapy technology, which can release more energy to kill the tumor cells and also has the effect of protecting the surrounding normal tissues. Generally, it can be used to treat central nervous system tumors, head and neck tumors, abdominopelvic tumors, etc. 1. central nervous system tumors: In the treatment of central nervous system tumors such as meningioma, the particle beam can focus on the tumor site for blasting, and does not affect the surrounding normal tissues, avoiding causing central nerve damage and other central damage symptoms; 2. head and neck tumors: For tumors at the base of the skull, nose and neck, such as nasopharyngeal carcinoma, chondrosarcoma, due to the close proximity to other organs, the use of proton heavy ion therapy can avoid damage to the normal function of organs such as the eyes and ears; 3, abdominopelvic tumors: for tumors in the abdominal cavity, pelvis and other larger areas, such as liver cancer, prostate cancer, can also be treated by proton heavy ion, a powerful irradiation of the tumor lesion; 4, other: for other radiotherapy failure, sensitive area tumors, the For patients with early stage tumors, treatment with proton heavy ion can also help patients to alleviate their conditions to a certain extent. When using proton heavy ion technology for treatment, it can strike the lesion with precision, when using it, the treatment site should be clearly defined to avoid causing damage to the surrounding healthy tissues.