In medical science, there is no cure for lung cancer, and five-year disease-free survival is mostly used as a reference. If a patient with lung cancer has a disease-free survival of five years or more, it can be called a clinical cure. Lung cancer can be classified into small cell lung cancer and non-small cell lung cancer according to histological classification. Among them, small cell lung cancer can be divided into two stages according to the progression, namely the limited stage and the extensive stage. In the limited stage, radical radiotherapy can be administered, and the five-year survival rate of patients can reach about 20%. In the extensive stage, cancer cells have metastasized to other important organs, and the treatment aims to improve the quality of life and prolong life. Non-small cell lung cancer can be divided into 4 stages. Stage I, i.e. early stage, has a high five-year survival rate through surgical treatment. Stage II and III are middle and late stages, and patients still need radiotherapy and chemotherapy to improve their quality of life after treatment by surgery, and the five-year survival rate is lower than that of early stage patients. Stage IV is advanced stage, with no possibility of cure for the time being. Patients in this period lose the opportunity of surgical treatment and can choose radiotherapy and chemotherapy to improve patients’ quality of life. Patients diagnosed with lung cancer should avoid bad emotions such as tension and anxiety, and actively carry out treatment to improve the quality of life.