Objective: In traditional medicine, Artemisia capillaris has been used for treatment of chronic diarrhea. Previously we found Artemisia capillaris had an effect on rats with TNBS-induced colitis. Eupatilin, a kind of fla- vonoids, may be a probable effective component. To evaluate the effect of a eupatilin derivative compound DA-6034 on the rat with TNBS-induced colitis, we perfomed this study, Methods: Colitis was induced with 1ml of 50 mg/ml TNBS mixed with 60 % ethanol (vol/vol) in Sprague Dawley rats. From the next day, 1ml methylcellulose, 1 mg/kg prednisolone, 0.3 or 3 mg/kg of DA-6017 and DA-6034 were administered through once daily for 2 weeks. At 2days, lweek, and 2weeks later, we evaluated the effect by gross damage score (0-10) and measured myeloperoxidase, PGE2, and L from the damaged mucosa. Results: The mean gross damage scores of prednisolone end 3 mg/kg of DA groups were significantly lower than that of a placebo group at 2weeks(0.8, 0.9 vs. 4.0, p<0.05). Myeloperoxidase activities also seemed to be lower in those effective groups but were not statistically significant. LTB4 levels were lower in prednisolone and, 0.3 and 3 mg/kg of DA groups than in a placebo group at 2weeks(7.91, 7.23, and 7.13 vs, 13.90 ng/mg protein, p＜0.05), PGE2 levels were decreased in prednisolone and 0.3 mg/kg of DA-6034 groups at 2days. DA17 showed no effects. Conclusions: Eupatilin derivative compound, DA-6034 was effective in rats with TNBS-induced colitis. In that LTE4 leve1 is lowered with some decrease of PGE2 level, this agent probably has an inhibitory effect on arachidonic acid metabolism.