"Since October of 2006, the Three Gorges Reservoir (TGR) has finished the impoundment from 156 m to 175 m.In order to find the influence of the impoundment to the plant community and its爷 pattern in the drawdown zone further, an investigation on the plant community of the Baijia Creek was conducted again from July to August 2011. The plant community and its’ pattern under the influence of impoundment at 175 m was compared to the 156 m. The results show 101 species of vascular plant belong to 39 families, 93 generas have been investigated, among which 84 species belong to 30 families, 74generas distributed in the drawdown zone. The distribute area of Xanthium sibiricum and Paspalum paspaloides, which once were dominant species in the drawdown zone, decreased obviously. Cyperus rotundus, Echinochloa crusgali var. zelayensis,and Aeschynomene indica come to be new dominant species in the study area. The impoundment of the TGR to 175 m influenced the plant community and its爷 pattern in the drawdown zone significantly."