Radiotherapy and chemotherapy surgery are the 3 main treatments for malignant tumors nowadays. 55% of malignant tumors can be cured, of which radiotherapy cures 22% of them. The combination of radiotherapy and chemotherapy is very commonly used in clinical practice, which can improve the local control of tumor and reduce distant metastasis at the same time. Simultaneous radiotherapy and chemotherapy have become the standard treatment mode for many tumors, such as locally advanced head and neck tumors, locally advanced non-small cell lung cancer, limited small cell lung cancer, esophageal cancer, rectal cancer, and bladder cancer. In addition, in breast cancer, laryngeal cancer, anal canal cancer, bladder cancer and soft tissue sarcoma of the extremities, simultaneous radiotherapy allows organ function to be preserved. Whether radiotherapy or chemotherapy is just a treatment for malignant tumors, the prognosis is highly dependent on the early or late stage of the patient’s condition at the time of consultation. The earlier the period of diagnosis, the higher the possibility of cure. For example, the five-year survival rate of stage I non-small cell lung cancer can reach 70%-90%, while the five-year survival rate of stage II non-small cell lung cancer is about 50%-70%, while the five-year survival rate of locally advanced non-small cell lung cancer with simultaneous radiotherapy is only about 15%-36%, and the five-year survival rates of nasopharyngeal carcinoma after stage I-IV radiotherapy are 95.5%, 87%, 76.9% and 66.9%, respectively. The five-year survival rate after radiotherapy for early stage Hodgkin’s lymphoma is about 80%. Therefore, it must be recommended to have regular checkups for early detection, so as to get timely treatment and maximize the treatment of malignant tumors.