Cough back patting and phlegm expulsion techniques for the patient to choose a sitting position or side lying position, the fingers are flexed, the back of the hand is hollow from the bottom to the top, from both sides of the back to the middle position in order to pat. The technique of back patting and phlegm expulsion is mainly through knocking the patient’s back, so as to produce vibration on the chest to make the sticky phlegm adhering to the trachea and bronchial tubes fall off, and to promote the expulsion of phlegm through the way of postural drainage. In the process of patting the back, pay attention to the thumb of the hand close to the remaining four fingers, the palm of the hand in the shape of a cup, the wrist joint can not be moved, relying on the power of the shoulder and elbow joints to drive the palm of the hand patting the chest and back. It should be noted that, in the process of patting the back, the strength of patting can not be too big or too small, pay attention to avoid the spine, kidneys and other parts of the spine, avoid patting the back before and after the patient’s vital signs are unstable or eating.