Pulmonary interstitial fibrosis belongs to the category of "lung collateral disease " in Traditional Chinese Medicine（ TCM）

which is the initial factor of disease such as deficient root and excessive superficial syndrome

body resistance weakened while pathogenic factors prevailing and impaired depurative descending of lung qi

and qi deficiency

phlegm resistance

blood stasis

toxicity

and phlegm stasis are the basic pathogenesis. The basic treatment principle of"collateral needs circulation"was put forward by YE Tianshi in his work Guide to Clinical Practice with Medical Records（ 《临证指南医案》）

and was commonly used in the treatment of collateral diseases. According to the disease characteristics of pulmonary interstitial fibrosis caused by deficient root and excessive superficial

the basic rule of "collateral needs circulation"is formulated. Specifically

patients with lung deficiency need treatment of promoting menstruation and tonifying methods

and patients with obstruction of collaterals in lung need treatment of promoting menstruation with pungent drug. Once the obstruction of collaterals in lung was removed

and the flow of qi and blood was activated

the disease is about to heal.