The pathological changes of pulmonary fibrosis, mainly the changes of fibrosis caused by long-term lung inflammation, are as follows: 1. Actual evidence: the basic pathological changes with phlegm and blood stasis as the main. It is recommended to use some drugs that activate blood, resolve blood stasis, resolve phlegm, promote lung, and calm asthma, such as peach kernel, almond, half-xia, and Chen Pi, as well as drugs that activate blood and break blood, such as whole scorpion and ground dragon. 2. deficiency evidence: fibrosis formation leads to deficiency evidence, which all belong to the category of lung impotence in Chinese medicine. In this case, we should strengthen the spleen, cultivate the earth to generate gold and resolve phlegm, and we can use lung tonic soup, such as the commonly used Radix Codonopsis, Astragalus, Radix Rehmanniae, Rhizoma Dioscoreae and Rhizoma Atractylodis, together with drugs that resolve phlegm, invigorate blood and eliminate blood stasis, such as Jiang Hanxia, Di Long, White Mustard Seed and Chen Pi. In conclusion, for pulmonary fibrosis, treatment must be carried out by identifying the deficiency and reality, and it is also recommended to quit smoking and keep the respiratory tract clean.