Lung adenocarcinoma of alveolar type belongs to a type of higher malignancy in the pathological classification of lung cancer, but its overall malignancy is also related to the relationship between the degree of differentiation of tumor cells and the stage. There are various pathological types of lung cancer, including squamous cell carcinoma, adenocarcinoma, large cell carcinoma, neuroendocrine carcinoma, etc. Lung adenocarcinoma accounts for 40%~55% of lung cancer. Among them, adenocarcinomas that are predominantly alveolar are called pulmonary alveolar adenocarcinomas, which have a higher degree of malignancy. However, the prognosis is also related to the patient’s stage. Patients are staged according to the development of primary tumor, the degree of lymph node metastasis and whether distant metastasis occurs. The later the staging, the more complicated the condition and the worse the prognosis. Generally speaking, the five-year survival rate of lung cancer patients whose tumor is confined to the primary site is 61.2%, the five-year survival rate of patients whose tumor has infiltrated into regional lymph nodes is 33.5%, and the five-year survival rate of patients who have already developed distant metastasis is 7%. Therefore, patients should strive for early detection, early diagnosis and early treatment in order to get a better prognosis.