Urban river is a flowing, relatively open and complex ecosystem in urban landscape, which is closely related to the living environment of urban residents. Rivers have a certain ability to self purify and recover external pollution. However, due to the large number of residents along urban rivers, the production and life of residents have a huge impact on urban rivers, resulting in the continuous degradation and loss of ecological functions of urban rivers, black odor and mosquito breeding, which not only lose the function of urban landscape, but become a burden of the city: interfere with the normal production and life of residents, and affect the reputation of the city.

The treatment and maintenance of river water bodies mainly focus on pollutant reduction and ecological self purification function restoration of polluted water bodies. Remove ammonia nitrogen, BOD and other pollutants in the water body, and improve the oxygen content and transparency of the water body. Establish a stable ecosystem of the river, restore the ecological chain of the water body, realize the self purification of the water body, and maintain the water quality.