Water in the lungs, i.e. the formation of pleural effusion, can be cured at this time depends mainly on the cause of the disease. Most of the pleural effusion can be cured, only a few patients can not be cured, but can only be controlled appropriately. For example, if the pleural effusion is formed by bacterial or tuberculosis mycobacteria infection, such patients should be treated with effective and sufficient anti-infection treatment, together with the necessary drainage of pleural fluid, the pleural effusion can be cured. In addition, the pleural effusion caused by hypoproteinemia can be cured with albumin supplementation and appropriate diuretic treatment. For pleural effusion caused by heart failure, it can be cured by cardiotonic, diuretic and vasodilator treatments, but its pleural fluid is easy to recur. For patients with malignant pleural effusion, it is not curable at this time, because its pleural fluid grows faster, and the amount of pleural fluid produced is also larger, and the patients need anti-tumor treatment more often than not, in order to control the formation of pleural fluid, but the patients are more often than not clinically dead because of this.