This study is to investigate the removal rates of nutrient in water, the biomass of water plants, and the total amounts of T-N and T-P uptakes by water plants to evaluate the ecological characteristics of the constructed wetland for treatment of livestock wastewater in Yangji-ri, Nonsan-si from June through November 2011. During the experimental period, the monthly plant biomass of constructed wetland in July were the highest as 669.4 ㎏, while the lowest in November as 200.1 ㎏. The research showed that the average nitrogen and phosphorus contents in aboveground and underground biomass of Phragmites australis were 21.9 ± 0.6 ∼ 32.1 ± 1.5 ㎎/g, 15.1 ± 5.5 ∼24.9 ± 5.7 ㎎/g, 1.5 ± 0.3 ∼ 2.4 ± 0.2 ㎎/g and 1.6 ± 0.6 ∼ 2.5 ± 0.6㎎/g, respectively. The maximum amount of T-N and T-P uptake by Phragmites australis were 28.0 ㎏ in July and 2.5 ㎏ in June, respectively, while the minimum amount of T-N and T-P uptake by Phragmites australis were 9.7 ㎏ and 0.7 ㎏ in November,respectively. The removal rates of T-N and T-P in constructed wetland for treating livestock wastewater were 23.0 % and 59.1 %, respectively. The results of this study is expected to deduce the circulation of contaminants and nutrient in the wetland afterwards.