Lung nodules larger than 1cm are not necessarily malignant, but the possibility of malignancy is extremely high. If a patient’s lung CT indicates a nodule of 1cm, further relevant examinations must be completed to clearly diagnose the degree of benign and malignant nodules, and the examinations that need to be completed include tumor series, sputum examination for cancer cells, bronchoscopy, puncture biopsy of nodules, etc. Malignant tumors can be clinically diagnosed by finding cancer cells in sputum or tumor cells in bronchoscopy and puncture biopsy, and after the diagnosis is confirmed, we can treat it with surgery, radiotherapy, chemotherapy, target cell drugs, or immunotherapy. If a benign nodule is diagnosed after the above tests, we do not need to treat it surgically. We only need to review the nodules periodically, after six months or a year, to observe any dynamic changes, and we need to pay further attention if there is a significant growth of the nodules in the patient.