Abstract:The research of ecological footprint method applied in national scale was more successful than applied in urban scale. Besides the defect of trade-correct, the environmental liability of greenhouse gases was ignored when ecological footprint was applied in urban scale. The standard of urban sustainable development should be redefined base on its regional characteristic, where the city belongs to. After analysis of environmental liability in ecological footprint frame between urban scale and national scale, the distribution method of greenhouse gases environmental liability in urban scale were constructed by classifying the cities and computing the index of economic relation intensity. This method could improve the credibility of ecological footprint model applied in urban scale.