tThe current ecological situation of aquaculture water quality in Wushe (Songjiang district, Shanghai city)district is not up to mark. In the present study, characteristic of ecological agriculture park was first inves-tigated and then water spinach floating bed was used to improve the aquaculture wastewater quality.The results showed significant improvement in the aquaculture water quality at the experimental sitewith removal rates of TN, NH4+-N, NO2−-N and TP were 11.2%, 60.0%, 60.2% and 27.3%, respectively. More-over, we found that the removal mechanism of ammonia nitrogen and nitrate nitrogen by water spinachwas mostly by microorganism, whereas the removal mechanism of phosphorus was mainly by plantabsorption. In addition, water spinach could be harvested at regular time intervals, which could achievegood economic benefits. This research could provide a good case study for sustainable development inecological agricultural park for other cities around the world.