Using water dropwort and watercress as the planting stuff on ecological floating beds, the purification effectiveness of eu-trophic water and their characteristics were investigated. The results showed that aquatic vegetable not only could grow well in eu-trophic water bodies, but also was able to purify the eutrophic water bodies effectively, and the purification ability increased treatment time. The removal rate of TN、NH₄⁺-N、TP、COD_Mn,and Chl. a reached 76.86%, 69. 39%, 90.45%, 95.03%,89.81% by water dropwort for 20d treatment, respectively. In addition, the removal rate of TN、NH₄⁺-N、TP、COD_Mn,and Chl.a reached 78.27%,67.95%,89.98%,95.38% and 91.28% by watercress for20d treatment, respectively. It was dropwort and watercress had a significant effect on improving the quality of the eutrophic ment of nitrate and heavy metals in plants, so water dropwort and watercress were edible proved that water nutrition enrich-water, without producing according to food standard and could pro-dace certain economic benefits.