Multifrequency vibration sputum excretion machine is designed specifically for patients with pulmonary ventilation disorder. It not only can replace manual percussion on back, but also can row phlegm in deep lung which manual percussion on back cannot reach. It does not need patients’ position (manual percussion on back needs) and can achieve excellent postural drainage effect. The postural drainage in the current clinical treatment to postoperative patients or patients with respiratory infection is mainly completed by manual chest physical therapy (manual percussion on back) of medical staff. It is time-consuming (about 30 minutes/per person) and labor-wasting, and also leads to the discomfort of patients and fatigue of medical staff.