Object: Interstitial pulmonary fibrosis is a kind of disease mainly characterized by inflammation and structural destroy of alveolus, which finally changed into interstitial fibrosis. The therapeutic approach to this not particularly effective because of its unclear mechanism. Tranditional Chinese medicine has reached a several achievements in improving symptoms and reducing death rate, and it's necessary to summarize and improve the methods of TCM for this disease. Huaxian decoction(HD), a prescr...