Treatment of lung cancer: there are already very standardized treatment standards. We all strictly follow the national standard to formulate treatment plans for patients. Lung cancer is clinically divided into four stages: Stage I, II, III and IV. Stage Ⅰ is divided into ⅠA and ⅠB. Stage ⅠA can be treated by surgical resection without radiotherapy; stage ⅠB can be treated with four to six cycles of post-operative chemotherapy after surgery. Stage II is also divided into IIA and IIB. Stage IIA and IIB should be operated, and four to six cycles of chemotherapy should be performed after surgery. Stage III is also divided into IIIA and IIIB. Stage IIIA should be treated with surgery, four to six cycles of postoperative chemotherapy, and 50-60 GY of postoperative radiotherapy. Stage IIIB is mostly inoperable, (palliative surgery in only a few cases), and is mainly treated with chemotherapy and radiotherapy. Stage IV is also mainly treated by chemotherapy and radiotherapy. The specific staging needs the help of professional doctors to make a judgment.