Malignant tumors are a relatively common disease that has been on the rise in recent years, and their main treatments include surgery, radiotherapy, chemotherapy and other treatments. Currently, about 45% of tumors in the world can be cured, of which surgery contributes 22%, radiotherapy 18% and chemotherapy 5%. According to current statistics, about 70% of malignant tumors require radiotherapy at different times to control the disease. Specifically for each tumor patient, the need for radiotherapy is determined according to the specifications of tumor diagnosis and treatment, and different radiotherapy may be needed at different stages. Tumors requiring radiotherapy include: brain tumor (including primary brain tumor and metastatic tumor), nasopharyngeal carcinoma, nasal cavity tumor, paranasal sinus tumor, ear tumor, oral cavity tumor, perioral gland tumor, pharyngeal tumor, lung cancer, esophageal cancer, thymoma or carcinoma, mediastinal tumor, liver cancer, pancreatic cancer, part of gastric cancer, rectal cancer, renal cancer, ureteral cancer, testicular tumor, gynecological tumor, breast cancer, lymphoma and soft tissue tumor. Tumors. According to the different stages of the tumor, it can be divided into preoperative radiotherapy, postoperative radiotherapy and so on.