Objective To explore the mechanism of Qiqi Guben(QQGB) decoction treating Ulcerative Colitis(UC). Methods The 90 patients with UC divided into two groups, in which, 50 patients in treatment group were treated by QQGB with double methods of drinking and clysis, and 40 in control group by tablet Sulfasalazine (SASP). The treatment course was 60 days. Result The total valid rate in QQGB group was 94%. Which was more effective to that in SASP group (P〈0.05). After QQGB treatment, the B cell was reduced and Ts cell and total T cell were inc...