Effects of Ipomoea aquatica euhivation on artificial floating rafts on water quality of intensive aquaculture ponds were studied using total phosphorus (TP), total nitrogen (TN), orthophosphate phosphorus (PO_4~(3-)-P), nitrate nitrogen (NO_3~--N) , nitrite nitrogen (NO_2~--N), ammonium nitrogen (NH_4~+-N), CODMn and chlorophyll-a (Chl a) as main waterquality indexes, and its mechanism of purifying the water was explored in an experiment. Results show that the yield of Ipomoea aquatica, harvested four times, reached as high as 69618.0~73161.6 kg·hm~(-2).In Treatments 10% and 20% (refers to coverage of the pond by Ipomoea aquatica) 27.51 and 52. 35 kg·hm~(-2) of TN and 2. 83 and 5.39 kg·hm~(-2) of TP were, respectively, removed with the harvest of lpomoea aquatica. In terms of the water quality indexes, Chl a, TN, NH_4~+-N, NO_2~--N, NO_3~--N, TP, PO_4~(3-)-P, and CODMn, the three treatments followed a decreasing order of CK > Treatment 10% > Treatment 20%. And the removal rate of Chl a, TN, NH_4~+-N, NO_2~--N, NO_3~--N, TP, PO_4~(3-)-P, and CODMn in Treatment 20% varied in the range from 15. 16% to 49. 02%, from 9. 04% to 36. 56%, from 19. 23% to 46. 34%, from 22. 76% to 47.74%, from 13. 33% to 56. 52%, from 33. 33% to 45. 10%, from 27. 27% to 48. 15%,and from 3. 13% to 19. 05%, respectively. Fish survival rates in the treatments improved significantly as is compared with that in the control. So it was obvious that in ponds rearing fries of crucians, bighead carps and grass carps, cultivating Ipomoea aquatica on artificial floating rafts could accelerate water material cycling and strengthen self-purification capability of the water body. And it is advisable to set coverage of the pond by Ipomoea acluatiea at 20%.