Phellodendron Guadua San is the name of a traditional Chinese medicine preparation for the treatment of dry phlegm cough, cough with choking urgency, cough with unpleasant phlegm, astringent and difficult to get out, dry throat, white and dry coating. The main identification point is that this formula is a commonly used formula for treating dry phlegm syndrome. Clinical application is based on coughing and coughing with phlegm, dry throat, white and dry coating, and changes in the identification of medicine points plus or minus such as concurrently feeling windy evil, itchy throat and coughing with slight evil wind can add mulberry leaves, almonds, cicada molasses, burdock, etc. If the throat is dry and astringent, add maitong, xuan ginseng, raw gypsum, etc. If the voice is hoarse and blood is in the sputum, orange red can be removed and southern ginseng, Agaricus blazei and Bletilla can be added. Modern application of this formula can be used for pulmonary tuberculosis and pneumonia. Note for use: For cough with deficiency of lung and kidney yin and inflammation of deficiency fire, it is not appropriate and should not be used.