At present, the treatment efficiency of ecological floating bed is not high, the number of floating bed plants is not large, the impact of external conditions on the treatment effect is not clear, and the mechanism of treatment is not deep enough, which limits the full application value of ecological floating bed technology. In order to explore more efficient floating bed plants and find out the influence of various external factors on the treatment effect of floating bed, the ecological floating bed technology can better serve the treatment of eutrophic water bodies. In this paper, the state floating bed is used as the carrier, and the purification effect of eutrophic water body is studied by two groups of experiments using the rarely used ecological floating bed technology to treat polluted water body. All the plants survived and grew well in the process of the experiment, which has certain economic and practical value. The removal rates of DP, TN and TOC were 95.0%, 96.97% and 92.53% respectively.