Abstract:Employing the emergy analytical method and taking Beijing, Tianjin and Tangshan of the “Beijing-Tianjin-Hebei” region as the research objects, this paper establishes the emergy indexes of complex ecosystem and sustainable development, and conducts the comparative analysis of natural environments and socioeconomic sustainable development in these three cities from the year 1991 to 2005.The results show that, from 1991 to 2005, since local resources emergy in Beijing and Tianjin has provided insufficient driving forces to regional economic development, urban development of these two cities has seen increasing independence on external resources; the emergy indexes of social subsystem in these three cities are on the rise, indicating the steadily improved both living standards for urban residents and economic development levels; and the indexes of economic development level in Beijing are superior to those of Tianjin and Tangshan, but the emergy indexes of environment subsystem and sustainable development suggest that Beijing has the heaviest environmental pressure among these three cities, and its sustainable development capacities are lower than those of Tianjin and Tangshan. Based on this analysis of the three cities, several proposals concerning the sustainable development of Beijing, Tianjin and Tangshan are put forward to provide scientific grounds for formulation of urban development strategies and industrial restructuring.