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In order to explore the effect of bionic plants constructed with different fillers on the removal of pollutants in river waters, this study made sponge filler and biological rope filler into bionic plants, and compared the biofilm attached to the two bionic plants through long-term field film tests. The bionic plants that were successfully coated with the film were subjected to an indoor purification test to prove the removal of COD, ammonia nitrogen and other pollutants in the water by the bionic plants.