Objective To discuss the medication regularity of traditional Chinese medicine (TCM) in the treatment of pelvic inflammatory disease, and provide new thinking for effective medication in clinical medicine. Methods Keywords combined with free word were used to comprehensively search CNKI, VIP, Wangfang, CBM, PubMed and EMbase, databases and Cochrane library to collect randomized controlled trials of comparative treatment of pelvic inflammatory disease between Chinese and Western drugs. The TCM prescriptions covered in the randomized controlled trial were selected in strict accordance with the standard inclusion and exclusion criteria. Excel was used to statistically analyze the four properties, five flavors, meridian and medication frequency of TCM prescriptions. Then, systematic clustering software was used to carry out correlation, clustering and principal component analysis for the Chinese medicines with high using frequency. Results The study included 235 randomized controlled trial and 320 prescriptions of traditional Chinese medicine were involved, the average number of herbs was 13.29, which Yanhusuo, Chishao, Danggui, Pugongying, Danshen were with top five frequency. A total of 41 drug pairs with high association were obtained by association rules, including Chishao-Yanhusuo, Eshu-Sanleng-Baijiangcao, etc. Thirty traditional Chinese medicine with high using frequency can be divided into 5 categories according to the effect. The obtained results of 9 principal component analysis were consistent with those in the system cluster. Conclusions In this study, evidence-based medicine and systematic cluster analysis were used to analyze the medication regularity of traditional Chinese medicine in the treatment of pelvic inflammatory disease, so as to provide reference for the clinical medication.