In order to select the suitable species for ecological rafts,which floating in one of estuaries of Dianchi Lake,Daqing river,a study of screening was carried out with four macrophyte species (Canna generalis Bailey,Vetivaria zizanioides,Zizania latifolia.,Typha angustata Bory et Chaub) with the adaptability test,resistance responses experiment,oxidation ability test of roots and water quality examination,by validating the variation of plant growth status and removal effect of the major pollutants (COD、TN、TP) under the wastewater pollution stress.The experiment shows that almost all index of the spare plants are different,the Canna (Canna generalis Bailey) has the best environmental adaptability in the four options,and the ability of removal of pollutants is the best.The results of this study indicated that a reasonable community structure is the dominant species of Canna (Canna generalis Bailey) with companion or other indigenous species,such as T.angustata Bory et Chaub.