Once a lung malignancy is diagnosed, there are several treatment modalities, but surgery is the preferred treatment for lung malignancy. If the patient is physically able to tolerate surgery, there is no metastasis elsewhere, the family is willing to do surgery, and the patient agrees and cooperates, surgery can be preferred. If surgery is not possible, radiotherapy and chemotherapy can be used. Radiotherapy and chemotherapy now generally require a pathological diagnosis, because different types of lung tumors may have different chemotherapy regimens. This requires the availability of biopsy, and obtaining biopsy can specifically guide the use of drugs. It is possible to obtain a pathology through surgery, a pathology through puncture, or a pathology through bronchoscopy. If the patient has a mutation in the gene of adenocarcinoma, some drugs can be used accordingly. Some drugs are sensitive to adenocarcinoma, but the prerequisite is genetic testing, and after the test results are available, targeted drugs can be better used. The advantage of targeted drugs is that they have fewer side effects compared to chemotherapy and radiotherapy and can be tolerated by patients, so the doctor has to make a comprehensive judgment on the specific way to adopt them. Immunotherapy can also be considered for patients without targeted gene sensitivity mutations.