The staging of lung cancer is based on the size of the cancer cells, that is, the diameter of the long path, the presence of regional lymph node metastasis, and the presence of distant organ metastasis to distinguish the four major stages, and there are several smaller stages under each major stage, which is very complicated and cannot be explained in a few words. The survival time of different stages is statistically answered by the 5-year survival rate: the 5-year survival rate of lung cancer in stage IA is about 77%-92%; if it enters stage IB, the 5-year survival rate is about 68% in the eighth edition of TNM stage now. After stage II, the 5-year survival rate drops to 53%-60%, which means about 53-60 people among 100 people will live for 5 years. The 5-year survival rate for stage IIIA is about 36% and drops to 13% for stage IIIC. If the lung cancer is found to have distant metastases by the time stage IV is reached, the 5-year survival rate is less than 10%.