The treatment of prescription of QingChangHuaShi in moderate active ulcerative colitis: a multi-center clinical study

INTERVENTION: QingChangHuaShi Group:basic treatment and QingChangHuaShi Granule;QingChangHuaShi (low dose) Group:basic treatment and QingChangHuaShi (low dose) Granule; CONDITION: ulcerative colitis PRIMARY OUTCOME: Rate of clinical effecacy;Rate of clinical remission; SECONDARY OUTCOME: endoscopic response rate;endoscopic remission rate;TCM clinical syndrome efficacy;Laboratory tests;recurernce rate; INCLUSION CRITERIA: 1. A confirmed diagnosis of ulcerative colitis, using 5‐ASA for at least 4 weeks: (1) the disease stage is still active phase; (2) the disease severity is moderate, score of 6 to 10 on the Mayo scale and moderately active disease on sigmoidoscopy (a Mayo endoscopic findings subscore of 2 or 3); 2. The TCM differentiation is damp‐heat syndrome of large intestine; 3. Male and female,age between 18‐65; 4. Informed consent is signed.