| [objective] based on the platform of traditional Chinese medicine inheritance assistance, to investigate the medication law of professor fan yongsheng in the treatment of interstitial lung disease (ctd-ild) related to connective tissue disease. [methods] data mining method was used to analyze the frequency of drug use, the law of association between drugs, and the law of prescription in the prescription of professor fan yongsheng''s treatment of ctd-detector, so as to extract professor fan''s academic experience in the treatment of ctd-detector. [results] professor fan yongsheng treated interstitial pulmonary disease with connective tissue diseases including systemic lupus erythematosus, scleroderma, dermatomyositis, mixed connective tissue disease, etc. Through the analysis of 201 prescriptions of ctd-ild-treated, a total of 166 traditional Chinese medicines were used, and the use frequency of sweet medicine was the most, 89 (53.54%). The use frequency of bitter drugs was 77 (46.64%). The use frequency of pungent drugs was 67 (40.34%). Sour and salty drugs were used less frequently. There are 5 kinds of Chinese herbal medicines used more than 100 times, which are poria cocos, atractylodes macrocephala, radix platycodonis, radix paeoniae alba and liquorice respectively. Commonly used combination has atractylodes and tuckahoe; Radix paeoniae alba and poria cocos; Radix atractylodes and paeoniae alba; Atractylodes macrocephala, poria cocos and paeony alba; Astragalus membranaceus, atractylodes macrocephala and poria cocos, etc. The combined use frequency of the two traditional Chinese medicines was more than 50 times, and the associated confidence was more than 80%. There were 3 pairs, namely cassia twig and astragalus membranaceus, cassia twig and white peony, cassia twig and poria cocos. The combined use frequency of the three traditional Chinese medicines was more than 50 times, and the associated confidence was more than 80%. Cassia twig, poria cocos to astragalus; Cassia twig, poria cocos to atractylodes. Professor fan yongsheng''s clinical symptoms are mainly based on the treatment methods of removing dampness, clearing collaterals, clearing heat, promoting lung and benefiting qi and Yin. [conclusion] professor fan yongsheng has rich clinical experience in the treatment of ctd-ililand. In the treatment, it is used in the treatment of cold and bitter, and focuses on regulating lung, protecting spleen and stomach, and regulating qi.