Abstract: Hyriopsis cumingii’s purifying effect was compared between upper and bottom stocking. The results indicated that Hyriopsis cumingii’s upper and bottom stocking can significantly reduce （P<0.05） the total nitrogen （TN）, the total suspended substance （TSS）, chemical oxygen demand （COD） and chlorophyll a （chla）, but the removal efficiency of total phosphorus （TP） was not significant. The removal efficiency of eutrophic water was not significant between upper and bottom stocking.

Key words: Hyriopsis cumingii, eutrophic water, stocking mode