Objective: To observe the clinical effect of retention enema of TCM combined with western medicine(WM) for chronic ulcertive colitis (CUC). Methods: 140 cases of CUC were allocated to two groups randomly, the treatment group (84 cases) treated by clonic application of Sibai Sanhuang enema solution combined with smecta (ST) and salazosulfapyridine (SASP), the control group (56 cases) by retention enema of ST and SASP adding with 100ml of warm normal saline. The curative effects were evaluated after 3 weeks o...