Lung adenocarcinoma is usually divided into undifferentiated, low-differentiated, moderately differentiated and highly differentiated cancers, among which undifferentiated cancer is the most serious. 1. Undifferentiated adenocarcinoma: it is the most malignant type of lung adenocarcinoma, and this type of lung adenocarcinoma is easy to recur and has the worst prognosis. 2. Hypofractionated cancer: it is a kind of lung adenocarcinoma with relatively high malignant degree, and its condition progresses faster in the process of development, and it is very easy to metastasize or spread. 2. Moderately differentiated carcinoma: it means that the lung adenocarcinoma is in the middle stage, which may belong to the early stage or the middle stage. The prognosis of this kind of lung cancer is relatively good, and timely treatment can control the metastasis and spread of cancer cells. 4. Highly differentiated carcinoma: it is the best differentiated type of lung adenocarcinoma at present, and most of the patients have a high survival rate and good prognosis after regular treatment, which can prevent the cancer cells from metastasizing or spreading to the distal part of the lung. If lung adenocarcinoma can be detected, diagnosed and treated early, the prognosis is good and can prolong the survival time of patients.