On the basis of the connotation of sustainable development and adopting a completely graded layer structure, this thesis established an evaluation index system for urban ecosystem. The evaluation index system included 3 levels. The first level was the target level, selecting the capacity of urban integrate development as the target. The second was criterion level, including the level, force and coordination degree of development. The third was index level, selecting 30 concrete items. Nanjing urban ecosyste...