Lung lavage is accurately called high-capacity total lung lavage, and the whole procedure is performed under general anesthesia, figuratively speaking, it is a procedure to give the lungs a bath. It is performed by inserting a Y-shaped double-lumen bronchial tube from the patient’s mouth to separate the left and right lungs, and inserting a Y-shaped double-lumen bronchial tube into the lungs, mainly for gas-water separation. The right lung is ventilated by anesthesia, with pure oxygen ventilation, to supply oxygen and maintain gas exchange in the body, while the left lung is connected to an irrigation tube for lavage. The physician also inserts an ultra-fine fiberoptic bronchoscope into each of the two luminal bronchi to grasp the depth of the catheter, and through this special mirror can observe at a glance whether the double-lumen tube is in the proper position and is used to adjust it to the optimal position, a method that is This method is an important prerequisite to ensure that lung lavage is performed safely. Once the catheter is inserted, the lavage is ready for operation. The lavage bottle is suspended about 50 cm above the patient’s head, while the drainage bottle is placed on the ground about 60 cm below the operating table, and a box of fluid to be lavaged is neatly placed in the 37°C thermostat next to the operating table, each bag of fluid to be lavaged takes about 3~6 min to lavage one time, and it needs to be lavaged at least many times, which also varies from person to person according to the specific condition.