Clinical Study of Jianfei Kangfu Cao in the Treatment of pSS-ILD

Inclusion Criteria: 1. According to the 2012 ACR classification of primary Sjogren's syndrome . 2. CT confirmed interstitial lung disease; 3. DLCO≧40%; 4. Stable treatment for at least 12 weeks; 5. Patients with good compliance should sign informed consent before the tria. Exclusion Criteria: 1. The patient is using or has used anti pulmonary fibrosis drugs; 2. Pulmonary infection, tumor and other connective tissue diseases; 3. Chronic obstructive pulmonary disease, bronchial asthma and tuberculosis; 4. Patients with severe hypertension, diabetes and heart, liver and renal failure; 5. Women with reproductive needs; 6. Idiopathic pulmonary interstitial disease; 7. The researcher thinks that it is not suitable to participate in this experiment; 8. Participants in other clinical trials.