Abstract: In order to making use of botanic resource and empolder a new harmonious pesticide in China, the antifeedant activity of Wedelia chinensis Merr., against Ostrinia furnacalis was studied in this paper, adoptting laminae dipping. The test determine antifeedant activity of the four issues in Wedelia chinensis Merr against Ostrinia furnacalis.The results of research indicate that the methanol extract of flowers posseses the highest antifeedant activity in the four tissues of Wedelia chinensis Merr. ,the values of AFC50(media antifeeding concentration)at 24h on the 3rd instar larvae of Ostrinia furnacalis was 3408.31μg/ml, according to 2275.22μg/ml of media azedarach. The next is extract of root, whose AFC50 was 6618.8μg/ml. The antifeedant activity of leaves and stem, their AFC50 were 15449.81μg/ml and 23150.97μg/ml respectively.