Objective:To observe possible mechanism of Baitouweng Decoction's therapeutic effect through regulating the balance of Th17/Treg in patients with ulcerative colitis. Methods:Totally 40 patients with UC were randomly assigned to the treatment group and the control group. Besides,another 20 healthy volunteers were recruited as the healthy control group. Patients in treatment group were treated with Baitouweng Decoction(oral and enema treatment),and those in control group took Mesalazine. The proportion of Th1...