According to statistics, the five-year survival rate of stage I lung cancer is about 80%, and patients who die of lung cancer after recurrence within five years account for about 20%. The earlier the stage of lung cancer, the better, and the best treatment effect is in stage IA. It is important to be vigilant, try to diagnose early and treat early. Nowadays, with the popularization of thin layer CT census, more and more early lung cancers are discovered and more and more early lung cancers are clinically encountered to hospitals. Lung cancer is divided into four stages: I, II, III and IV. Stage I is called early stage lung cancer, stage II is intermediate stage, stage III is called middle and late stage, and stage IV is called advanced stage lung cancer. Surgery is preferred in the treatment of stage I lung cancer, and most patients can achieve cure after surgery. Clinical cure is the 5-year survival rate of malignant tumors, that is, if there is no tumor recurrence or metastasis within 5 years, the tumor is considered to be cured after treatment, not 100%, but there are relatively few recurrent tumors after 5 years.