In the field of the wastewater plant in Chengjiang County,an experiment was carried out to investigate the effect and mechanism of nutrient removal in oxidation ponds which were planted by nine submerged macrophyte. The result showed that,pho-toeynthesis of submerged macrophytes in oxidation ponds induced the high level of water DO and pH which increased the removal effects of TN and TP,but the decomposition of submerged macrophyte leaves enhanced the content of TN and TP in the submerged macrophyte oxidation ponds.1'he removal rates of TN and TP in the ponds,19.44%一64. 71 % and 28. 13%一98. 33 % respec-lively. And the contributions of direct absorption by submerged macrophytes are low, which removed 0. 26%一1. 54% of TN and 0.47%一1. 77% of TP in the oxidation ponds. The change of DO and pH have promoted nitrogen degradation and redox decomposi-tion,which removed 30.71%一65. 25% of TN and 73. 37%一93.34%,while the removal TP was mainly ways of chemical depo-sition and substrate adsorption in the ponds. Finally,Motamgeton pectinatua, Vallisneria spiralia, HydriUa rxrticiUata, Ceratophyl-lum demersum and Motamgeton lucens are chosen as the ones which had high nitrogen and phosphorus removal rates in submerged macrophyte oxidation ponds.