Wetland introduction: The Caohai Wetland Ecosystem is a natural ecosystem with a long history. It consists of Caohai deep waters, shallow swamps, sedge wetlands and meadows, as well as rich aquatic animal and plant species and high productivity. The composition of the aquatic community is one of the important factors in maintaining and regulating the ecological environment of the local and surrounding areas. It plays a decisive role in the local natural and social environment.