Abstract: Wetland is one of important parts of earth ecosystems and has huge economic, social, and environmental values. In comparison with other ecosystems, it plays un-substitutive roles in flood control, regulating run-off, flood detention and migrating dry, water purifying, regulating climate, etc. It is also the important factor of a health river. In this paper, on the basis of the investigation and the wetland f eature analysis of the Yangtze River Basin, the wetlands are divided into different regions and are respectively estimated. The definition of wetland conservation ratio is discussed so as to keep health Yangtze River. Finally, the wetland situation and classification method of wetland conservation ratio evaluation are analyzed.