The principle of lung lavage is to irrigate the patient’s lungs with saline, using the impact of saline to remove the dust or dust deposited on the lung surface, to collect the cells in the airways, or to prop open the tiny, compressed bronchial tubes to promote the discharge of foreign bodies, etc. It is used for diagnosis and treatment of diseases. Bronchoalveolar lavage technology through the fiberoptic bronchoscope on the level of bronchial lung segments or sub-pulmonary segments, repeatedly with sterile saline lavage recovery, its detection and analysis, mainly used for the diagnosis of diseases such as allergic alveolitis, interstitial lung disease, asbestosis and so on. For example, whole-lung lavage treatment for alveolar protein deposition disease can be performed under general anesthesia, respectively, on both lungs successively to wash the abnormal alveolar deposition of protein, reduce the continuous stimulation of lung tissue to control the development of the disease, so as to achieve the therapeutic purpose. Lung lavage is operated by professional doctors, and it is recommended that patients with this need should go to the hospital in time for treatment under the guidance of doctors.