Not only an independent disease， Chronic cough is also a common symptom in many acute or chronic pneumonic diseases such as cold， asthma， chronic obstructive pulmonary disease and any others. We can classify it to chronic cough if the cough persists for more than eight weeks clinically. The yang deficiency of the lung， spleen， kidney is the maily causes of chronic cough， while the key pathological factors is “cold” and “phlegm and retained fluid”， which should choose the drugs pungent in flavor and warm in property to disperse yang qi， open interstices and pass adjusts the canal， to search for the primary cause of disease in treatment. This method is originated from 《Inner Canon of Huangdi》 and established in 《Synopsis of Golden Chamber》， which has already been accepted and practiced by many physicians now， such as Xiaoqinglong Decoction， Shegan mahuang Decoction， Linggan wuwei jiang xin Decoction are all the representative prescriptions.