Postural drainage is often used in patients with lung pathologies, especially those who have undergone lung surgery or thoracic surgery, such as lung resection, lung abscess, bronchiectomy, tracheotomy, lung cyst, isolated lung, lung fibrosis, and other lung diseases or thoracic diseases. Through drainage, pus, sputum, various types of secretions, and cellular retention produced by the lung tissue in the body after surgery are discharged from the body. Drainage can be promoted by adjusting the patient’s body position so that fluid flows from the drainage tube into the drainage bag by gravity, greatly reducing the risk of infection. Drainage can also be promoted by vibrating and tapping the patient’s back. In addition, postural drainage can be used for hepatobiliary diseases, such as cholestasis and viral hepatitis, where drainage can be used to aid metabolism as the patient has problems with metabolic function. Of course, there are some patients who are not suitable for postural drainage, such as patients with fractures, cardiovascular and cerebrovascular diseases, those who have just undergone surgery, and those who are physically weak, where postural drainage can cause discomfort and can be dangerous in severe cases.