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The purification efficiency of chemical oxygen demand(COD) and the change of dissolved oxygen (DO) of domestic sewage was researched by testing 9 species of wetland plants along the Songhua River in Jilin City in this paper. It is shown that 9 species of plants can purify domestic sewage, and the purification ability is varied in different species. Polygonum persicaria L., Rudbeckia hybrida Hort....