To explore the compatibility rules of Salvia miltiorrhiza based on association rules and factor analysis.Methods:With the theme of “Salvia miltiorrhiza for external use”,we performed a “full text” search on the advanced search interface of CNKI,and using Excel and SPSS statistical software to frequency Analysis,association rule analysis,and factor analysis.Results:Among the 180 prescriptions included in the standard,except for Radix Salviae Miltiorrhizae,Radix Angelicae Sinensis,Cortex Phellodendri,and Radix Angelicae Dahuricae appeared the most frequently in single-flavor Chinese medicines; pungen,sweet,swee,warm and cold were the most common in property and flavour statistics; liver meridian,heart meridian and lung meridian were the most common; there were 44 kinds of clinical common diseases in TCM,with acne,gynecological diseases and burns the most.In the analysis of association rules,9 groups of drug pair combinations with the highest association strength were obtained.In the factor analysis,9 principal components were extracted,and the cumulative contribution rate of the factors was 53.50%.Conclusion:The clinical analysis of Salvia miltiorrhiza in clinical treatment data was integrated to explore the potential compatibility of Chinese medicinal,and to provide a basis for guiding the development of clinical medicine and new prescriptions.