To analyze rules of contemporary doctors' medication in treating blood stasis syndrome of psoriasis based on Traditional Chinese Medicine Inheritance Support System V2.5(TCMISS).Methods:“Psoriasis” or “white crust” was used as the subject word，and “blood stasis” or “invigorating blood and resolving stasis” was used as the free word.The combination of subject words and free words was used in searching following databases：CNKI，Wanfang Data and VIP.Prescriptions for the treatment of blood stasis syndrome of psoriasis vulgaris were collected according to inclusion and exclusion criteria，and they were performed data mining and analysis by the TCMISS.Results:A total of 35 literatures were included.And 10 core medicinal groups and 5 new prescriptions were got after mining association rules among the medicines.The most commonly used medicines for blood stasis syndrome of psoriasis vulgaris were Flos Carthami，Radix Salviae Miltiorrhizae，Semen Persicae，etc.Conclusion:In TCM treatment，invigorating blood and resolving stasis is used as the main principle in treating blood stasis syndrome of psoriasis vulgaris; mining medication rules in blood stasis syndrome of psoriasis vulgaris based on the TCMISS can not only objectively reveal clinical medication rules，but also provide references for related research.