For some early stage cancer and localized cancer, the treatment effect is better by using modern radiotherapy technology. Early stage laryngeal cancer, cervical cancer and nasopharyngeal cancer can be cured by radiotherapy, while lung cancer, liver cancer, pancreatic cancer, metastatic lung cancer, metastatic liver cancer and retroperitoneal tumor can be treated with modern radiotherapy technology, and the effect has been significantly improved. Facing the situation that tumor has become the first killer, how to choose the treatment method to achieve better efficacy and higher quality of survival? In many people’s view, no matter what kind of cancer is, only after surgery, the heart will be secure and the hope of survival will be greater. In fact, this is a wrong concept. Experts introduce that for some early stage and localized cancers, the treatment effect is better with modern radiotherapy technology. Early stage laryngeal cancer, cervical cancer and nasopharyngeal cancer can be cured by using radiotherapy, while lung cancer, liver cancer, pancreatic cancer, lung metastasis, liver metastasis and retroperitoneal tumor can be treated by using modern radiotherapy technology, and the effect has been significantly improved. Radiotherapy was born for the treatment of tumors and has been developed for more than 100 years. It can be broadly divided into three stages: primary radiotherapy, conventional radiotherapy and modern radiotherapy. Before the 1950s, it was the era of primary radiotherapy; during the 50 years from the 1950s to the end of the last century, it was the era of conventional radiotherapy; and in the 21st century, it has entered the era of modern radiotherapy. Radiation therapy is to destroy tumor cells by ionizing radiation. The goal is to make tumor receive high dose and normal tissue receive low dose, and kill tumor cells or tumor-related tissues by high radiation dose to control the tumor from growing, while minimizing the radiation side effects on normal tissues around the tumor. Radiation therapy is to detect the tumor through one or more imaging techniques and correctly determine the scope of radiation therapy (determine the target area), increase the tumor dose and reduce the radiation damage to normal tissues through radiation therapy techniques and equipment, increase the killing effect of radiation on tumor cells or the protection effect of radiation damage to normal tissues through the application of radiation sensitizers or normal tissue protectors, and improve the local control rate and reduce the distant radiation side effects through combined chemotherapy or drug-targeted therapy. To improve the local control rate and reduce the distant metastasis rate, thus improving the long-term survival rate. At the end of last century, with the development of medical technology, radiotherapy technology has also gained rapid development, so that radiotherapy has entered a new era of modern radiotherapy, which has three relative advantages: Firstly, radiotherapy is less restricted by blood vessels, because blood vessels have higher tolerance to radiation, and it is safer to use radiotherapy when tumor infiltrates blood vessels and surgery is difficult. Secondly, there is no site restriction, radiation is invisible, radiotherapy can be used in any site, especially in those sites where surgical exposure is difficult or important functional areas or tumor invasion cannot be removed, radiotherapy can be used, and the chance of radical treatment can be obtained for small early lesions. Thirdly, radiotherapy is non-invasive and has little effect on the whole body, and most patients with poor physical condition can tolerate radiotherapy. Fourth, it can treat multiple lesions in the whole body, such as brain metastasis of lung cancer, which can be treated with radiotherapy for brain metastasis along with radiotherapy for the primary lung lesions, which is the concept of whole body treatment by local means. For early stage laryngeal cancer, cervical cancer, nasopharyngeal cancer, etc., modern radiotherapy techniques are more effective and have less side effects. For lung cancer, liver cancer, pancreatic cancer, metastatic lung cancer, metastatic liver cancer and retroperitoneal tumor, the effect has also achieved substantial improvement. Clinical practice also shows that the 5-year survival rate of modern radiotherapy technology for stage I-IV nasopharyngeal carcinoma has now increased to 75%, the 5-year survival rate for early stage nasopharyngeal carcinoma is over 90%, and the 5-year survival rate for early stage non-small cell lung cancer has increased to about 70%. Modern radiotherapy techniques for treating tumors can be treated as long as imaging can detect them, and the earlier the better, the smaller the strike surface and the higher the cure rate.