Cancer is still among the malignant diseases that threaten human life and health, and human beings have never stopped exploring more advanced treatments for cancer. Proton therapy has emerged as the newest radiation therapy and is quickly becoming the new favorite radiation therapy in the medical field today. Proton therapy is the use of high-energy proton beams generated by a medical gas pedal and shot into the body at very high speeds. After the proton beam enters the body, most of the energy is deposited at the end of the shot, forming a sharp dose peak called the Bragg peak. Through adjustment, the Bragg peak can be made to cover the entire tumor target area at a specific depth and accurately, and release all the energy to the cancerous area, precisely killing the tumor without damaging the surrounding normal tissues, thus achieving a good treatment effect. Proton therapy is suitable for the following types of cancers: 1. Esophageal cancer, proton therapy can reduce the radiation dose to the heart and lungs, reduce the impact on heart and lung function, and reduce the side effects of surgery after radiation therapy and chemotherapy. 2. For lung cancer, proton therapy can reduce the radiation dose to normal lung tissue, heart and esophagus, reduce the impact of radiation on cardiopulmonary function, reduce fibrosis of lung tissue, and reduce the pain of eating and swallowing. For brain tumors, proton therapy can reduce the radiation dose to normal brain tissues, thus reducing the damage of radiation therapy to the brain. For liver cancer, proton therapy can give a very high radiation dose to liver tumors, so it can achieve a very good local control rate. Breast cancer, the benefits of using proton therapy are to reduce the radiation dose to the heart, lung and contralateral breast, to reduce the risk of myocardial infarction, to reduce the impact on lung function, and to reduce the risk of secondary tumors in the contralateral breast. Proton therapy for nasopharyngeal and oral cavity can reduce or even eliminate the radiation dose to the oral cavity, hypopharynx and esophagus, reduce the damage of radiation therapy to oral mucosa and throat, reduce the side effects of pain and dry mouth, reduce the damage to the taste buds of the tongue and preserve the sense of taste, reduce the need to place irrigation tubes, etc. For gynecological cancer, proton therapy can reduce the radiation dose to the small intestine, large intestine and ovaries, reduce the side effects of small and large intestine such as diarrhea, and reduce the impact of radiation on endocrine function. For pediatric tumors, proton therapy can significantly reduce the scattered low and medium radiation doses, which can reduce the impact on the growth and development of children, which is very important for their future development and can reduce the chance of secondary tumors. For pancreatic cancer, proton therapy can reduce the radiation dose to the liver, kidney and gastrointestinal tract, reduce the impact of radiation on liver function, reduce the impact of kidney function, and reduce the side effects of gastrointestinal tract.