Postoperative pleural effusion after lung cancer surgery is generally related to surgical reactivity and has little relationship with pleural metastasis of lung cancer itself. Therefore, postoperative pleural effusion after lung cancer surgery can effectively improve the immune status and nutritional status of the whole body after active anti-infective, oxygen therapy and comprehensive systemic conditioning, including nutrient solution, nutritional supportive therapy, human albumin, and transfusion of blood when necessary, which can promote the absorption of pleural effusion, and can be completely absorbed in 1-2 weeks in general. 2 weeks can be completely absorbed. Unless extensive pleural adhesion is caused after lung cancer surgery, resulting in hemopneumothorax and pneumothorax, at this time, it is necessary to give closed drainage of thoracic cavity, and pleural repair and thoracic adhesion surgery can be given if necessary, which can promote lung reexpansion and absorption of pleural effusion as soon as possible. Therefore, postoperative pleural effusion after lung cancer surgery is a routine complication of surgery, and it can also be secondary to lung infection, according to the effect of anti-infection and whether it needs to be repaired by surgery again, which is related to certain factors, and it can be cured in 1-2 weeks in general.