The effect of radiotherapy for lung cancer varies according to the purpose of treatment. Overall, more than 70% of measurable lesions can be shrunk through radiotherapy; for radiotherapy target areas with prophylactic irradiation, the local recurrence rate can be reduced through radiotherapy; for early-stage peripheral lung cancer, stereotactic radiotherapy can achieve effects comparable to surgery; for patients with advanced lung cancer, such as brain metastases and bone metastases, radiotherapy can improve patients’ quality of life, increase survival For patients with advanced lung cancer, such as brain metastases and bone metastases, radiotherapy can improve patients’ quality of life, increase survival, and enable patients to achieve better prognosis. Especially for patients with superior vena cava compression, which is the emergency of radiotherapy, such patients can improve the symptoms of superior vena cava compression and relieve the patients’ wheezing-like symptoms through radiotherapy, and the effect of radiotherapy is very good.