水体是公园景观的重要组成部分,能增加公园的灵气和情趣,美化环境;同时,也有利于野生生物的生存和发展,促进城市自然保护和提高生物多样性。但由于缺乏统一的系统规划,维持改造不够,我国90％以上的公园水体都遭到不同程度的污染,COD、BOD、TN、TP和非离子氨等指标,大多超过国家地面水环境质量四类标准。上海的公园水体面积普遍较小,大多不超过2000m~2,水体流动性差,排水设施不太完善,水体交换困难,并有大量底泥,富营养化比较严重。因此,如何减少污染物质的排入、移出水体营养盐和其它污染物质、调节水体生态系统结构、充分发挥水体的自净能力是改善公园水体质 Water body is an important part of the landscape of the park, which can increase the aura and taste of the park and beautify the environment. At the same time, it is also beneficial to the survival and development of wildlife, promoting urban natural protection and improving biodiversity. However, due to the lack of a unified system planning and insufficient renovation, more than 90% of the park’s water bodies in our country have been polluted to varying degrees. Most of the indicators such as COD, BOD, TN, TP and non-ionic ammonia surpass the fourth category of national surface water environmental quality standard. Shanghai’s park water area is generally small, mostly less than 2000m ~ 2, poor water mobility, drainage facilities are not perfect, water exchange difficulties, and a large number of sediments, eutrophication more serious. Therefore, how to reduce the discharge of pollutants, remove nutrients and other pollutants in water body, regulate the structure of water ecosystem and give full play to the self-purification capacity of water body is to improve the water quality of park water