Abstract:The evaluation of the sustainable development ability of urban ecological economic systems quantitatively has been more and more highlighted, following the non-invertible urbanization trend of the world. New methods are needed to solving the interface problem between nature and economic society. Founded by H.T. Odum, emergy synthesis has been seemed as a bridge between natural and economic system. Broken through the “energy quality wall” of traditional energy theory, emergy theory realized the unified asses...