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With the domestic construction demand for the development of low-carbon cities will need to establish a set of standards, a unified urban carbon accounting system provides the basic methods and data analysis of urban greenhouse gas emission reduction potential, carbon emission levels of different cities. In this study, the greenhouse gas emissions from urban sources is divided into six departments of industrial energy, transportation energy, living energy, commercial energy, industrial processes and waste, the establishment of a set for the city \greenhouse gas emissions accounting methodology, and Nanjing as an example of China's urban carbon emission characteristics were explored. The results show that the Nanjing total greenhouse gas emissions, the greenhouse gas emissions generated by energy consumption proportion highest, about 69%. The greenhouse gas emissions of the industrial process sector's share proportion, followed by 30%, the lowest proportion of waste sector greenhouse gas emissions, and 1%; energy-consuming sector, the industrial energy sector in Nanjing City, the city greenhouse gas emissions The largest contribution to greenhouse gas emissions, accounting for about 74% of the greenhouse gas emissions of energy-consuming sector; followed by the transport sector, its greenhouse gas emissions accounted for 11% of the energy-consuming sector; establish Nanjing greenhouse gas emissions inventory based on, filter the list of primary energy, industrial processes, and transportation sector produces carbon emissions, divided into industrial point source and non-point source and transport energy three categories. Industrial point sources include industrial energy (excluding electricity), industrial processes; surface sources include living (excluding electricity); transport energy, including carbon emissions generated by the transport energy. Nanjing, GDP, population, density of road network is selected as an alternative parameter, spatial interpolation spatial distribution of emission inventories and drawn the Nanjing industrial point source, point source of greenhouse gas emissions, mainly concentrated in the industrially developed and densely populated region of central Nanjing Qixia District, Shimonoseki District, Jianye District, Gulou District, Xuanwu District, Qinhuai District six regions. Luhe District, Pukou District, Jiangning District, Lishui District, Gaochun area due to the relatively remote location, industrial, social, economic is relatively underdeveloped, so the total amount of carbon emissions is relatively small. Nanjing transportation greenhouse gas emissions, mainly focused on the density of the road network, traffic volumes larger areas, while some less dense areas of the network of roads, traffic flow or road transport carbon emissions low.
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