As for the treatment options for early stage lung cancer, some doctors have clearly pointed out that complete surgical resection is the most suitable, and radiotherapy is only suitable for patients who are not suitable for surgery or unwilling to have surgery. But is this really the case? It has been proven that although the current treatment will of early stage lung cancer patients is still surgery, but since lung cancer mostly occurs in middle-aged and elderly people, the risk of surgery is relatively high, and the quality of life of many patients after surgery is difficult to be guaranteed; moreover, for patients with middle and late stage lung cancer, the effect of surgical treatment is often not as satisfactory. It must be said that tumor is a “systemic project”. In the treatment plan of cancer, surgery, radiotherapy and chemotherapy are equivalent to working together to fight against the enemy. For the treatment of early stage lung cancer, apart from minimally invasive surgery, there is another weapon in the hands of radiotherapists. This is radiotherapy technology. When radiotherapists use the technology, they can make a detailed treatment plan according to the patient’s specific situation, pinpoint the location of the tumor, avoid all vital organs, and completely “eliminate” the tumor from the inside out. It is no exaggeration to say that radiotherapy is the equivalent of a missile force, with the precision to be able to hit anywhere. In addition, the advantages of radiotherapy include less damage, shorter treatment time and lower cost. In addition to lung cancer, radiotherapy technology can also achieve good results in the treatment of other early cancers, such as liver cancer, laryngeal cancer, intestinal cancer and pancreatic cancer. With the continuous development of radiotherapy technology, clinical attempts have long been made to use radiotherapy for the radical treatment of early stage lung cancer patients. Clinical results prove that radiotherapy, like surgery, can completely destroy the tumor, and, the long-term survival rate of patients is equal to or even higher than that of surgery. In addition, radiotherapy can be administered not only in early stages but also in other stages of development of any type of lung cancer. However, since radiotherapy is a local treatment, the specific protocol should also be determined on a patient-by-patient basis. Currently, radiotherapy has improved the survival rate and quality of life of patients in terms of improving the accuracy of tumor treatment and effective protection of patients’ normal tissues, and has also evolved from a conventional radiotherapy technique to the most accurate one. The status of radiotherapy in lung cancer treatment has become pivotal. I believe that with proper application and continuous refinement of radiotherapy technology, radiotherapy technology will bring a better spring to lung cancer patients.