Xiaoqinglong Decoction comes from Shang Han Lun, which is the main treatment for wind chill and fluid retention. It is treated as a classic formula for cold-cough, which syndromes of no sweat but tight pulse, cough, cough with white phlegm, and vomiting. This article discussed the efficacy of Xiaoqinglong Decoction in tonifying yang in lung, which can help transport phlegm, and then cough can be relieved.