In the present research, aquaculture wastewater in Songjiang (Shanghai, China) Modern Agricultural Ecological Agriculture Park was purified by aquatic economic crop floating bed, which was grown by water spinach. Meanwhile, the purification effect of this aquatic economic crop floating bed was analyzed and the removal mechanism of nitrogen and phosphorus was clarified. In addition,a sustainable way of the ecological agriculture park was designed,which could provide a favorable guidance and case study for the sustainability way of the whole world.