Postural drainage (bronchial drainage) in Chest Physiotherapy , the technique used for airway clearance , is a means of mobilizing secretions in one or more lung segments to the central airways by placing the patient in various positions. gravity effect on various positions taken by the patient. When secretions are moved from the smaller to the larger airways, they are then cleared by coughing or endotracheal suctioning. Postural drainage therapy also includes the use of manual techniques, such as percussion, shaking, and vibration , coupled with voluntary coughing. after recovery some patients found lung function decreased in COVID-19 as known as coronavirus infection. post-treatment lung physiotherapy and chest physiotherapy can improve lung function. Goals and Indications for Postural Drainage Prevent Accumulation of Secretions in Patients at Risk for Pulmonary Complications Patients with pulmonary diseases that are associated with increased production or viscosity