For disgusting the boundary of forest ecosystem in watershed wetland fi'om others, we consider the land cover-types, canopy density, slope and slope aspect as the analysis indexes to present a method that how to demarcate the boundaries of forest ecosystem in watershed wetland and hydrological function, with the definition of forest ecosystem in watershed wetland and the process of hydrological effect gives a way to determine these indexes. This study has demarcated the boundaries of watershed wetland forest ecosystem in Zijiang river basin, w...