Summary of case history　,The patient was diagnosed as ''ulcerative colitis'' in a hospital one year ago ( August 2020 ) without obvious causes of diarrhea and mucopurulent bloody stool. After treatment with Mesalazine , the disease was relieved. Since then, repeated diarrhea, mucopurulent bloody stool, tookMesalazine by herself. Two weeks ago, due to ''cold'' and diarrhea, pus bloody stool, stool with clots, defecation 10 times a day, stool does not form, acute after heavy, abdominal pain before the stool, stool after remission. With fatigue, low fever, anorexia.,TCM diagnosis,　Rest dysentery, Qi stagnation and blood stasis with dampness, with symptoms.,Western medicine diagnosis,　Ulcerative colitis ( chronic recurrent active severe ).,Therapeutic methods,　The use of traditional Chinese medicine Renshen Baidu San and Buhuang JinZhengqi San for treatment.,Clinical outcomes,　Application of Renshen Baidu San and BuchangJinzhengqi San in the treatment of severe ulcerative colitis achieved good curative effect, diarrhea was significantly reduced.