Abstract: To measure the supply-demand level and the development capability of u rban ecolsystem is the prerequisite in ensuring urban sustainable develop ment. By using the analysis model of ecological footprint and the improved model of urban ecological carrying capacity, the utilization rate and supply degree o f natural resources in Harbin City in 1998〖KG-*2〗-〖KG-*7〗2005 were quantitat ively studied, with the supply-demand level and development capability of the C ity’s ecosystem measured and analyzed comprehensively. The results show ed that in 1998〖KG-*2〗-〖KG-*7〗2005, the demand of Harbin urban ecosy stem was greater than its supply. Though the ecological deficit had an annual de crement of 245%, the contradiction between demand and supply of the ecosystem was still obvious. The diversity index of ecological footprint and the d evelopment capability both presented an overall uptrend, but the increment of th e latter was far greater than that of the former, which illustrated the enhancem ent of the development capability being based on the consumption of ecological r esources, and the urban development being of not sustainable. Social economic me asures should be adopted to coordinate the contradiction between demand and supp ly and to realize the sustainable development of Harbin City.

Key words: community type, species diversity, soil nutrient, subtropical evergreen broad-leaved forest, topography.