The balloon is first tied to a straw, and it is more convenient to blow the balloon through the straw. After placing the closed chest drainage tube in the pneumothorax, the balloon should be blown, and the technique of blowing the balloon is to inhale as hard and as much as possible to blow the balloon as big as possible. The principle is that by blowing the balloon, the lung is reopened, and when the balloon is blown hard, tension appears in the lung, which facilitates the expansion of the lung. Therefore it is a principle of leverage, the larger the balloon is blown, the greater the tension in the lungs, the easier it is for the lungs to expand, do not be afraid to blow up the balloon. Try to blow the balloon as hard as possible, so that the lungs reopen as soon as possible, so blow the balloon to master the skills, try to make the balloon blow as big as possible.