Generally speaking, the 5-year survival rate of adenosquamous carcinoma of the lung refers to stage III is about 15%, and the specific survival period is related to the clinical stage, physical status and other factors. Adenosquamous carcinoma of lung refers to the same lung cancer tissue with both squamous and adenocarcinoma tissue types. Regarding the survival period of adenosquamous carcinoma stage III, “5-year survival rate” is commonly used in clinical practice to roughly assess the survival of tumor patients. Generally, the 5-year survival rate of stage III adenosquamous lung cancer is about 15%. However, due to the differences in clinical stage, physical status, pathological type, treatment method and other factors, the specific survival time is significantly different. Therefore, the specific survival time, which has obvious individual differences, cannot be generalized and needs to be judged according to the actual condition. Usually, the prognosis of this disease is better if standardized treatment is carried out in time in the early stage, and patients should go to the hospital for follow-up on time, so as to facilitate the doctors’ understanding of their conditions. To summarize, patients with stage 3 squamous lung cancer need to go to the hospital in time and cooperate with doctors for active treatment, so as to avoid delaying their condition.