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Energy efficiency and CO2 emission efficiency have been improved from 2005 to2010 in China, but the inter-provincial differences was larger. The provinces have the higher efficiency, which are located in the eastern coastal areas or the southern regions. The provinces have the lower efficiency are located in the central and western inland areas or northern regions. There is a very close relationship between energy use and CO2 emission efficiency in China. Energy saving is the biggest dominant factor of CO2 emission efficiency improvement. Energy conversion plays a efficiency improvement role in some provinces. But industrial structure is the biggest factor hindering the improvement of CO2 emission efficiency. In the future, we should focus on the rational use of energy, regard energy conservation as the dominant factor of carbon emission efficiency improvement, and excavate the enormous potential of the energy conversion factor and expansion the industrial structure factor effect through industrial transformation.

Abstract. Regional difference of China's CO2 emission is basically in line with the trend of China's economic development that the emission is higher in the eastern coastal areas and lower in the western inland areas. The characteristic of the changes of the total CO2 emission is that the growth rate significantly accelerated after 2000. The basic factor which acts as a drive of CO2 emission increase is economic scale factor and the energy saving factor contributes to the decrease of CO2 emission. The driving power of the population factor and energy conversion factor is weak especially the influence of energy conversion factor is very instable. All the provinces are driven by positive driving force in economic scale factor and most provinces with great driving power are located in the eastern coastal areas. All the provinces are driven by positive driving force without expectation in energy conversion factor and most provinces whose energy saving efficiency improvement is of range small are driven poorly are located in the inland. Provinces are mostly driven positively in population size factor and this is related with size and orientation of driving force and population growth. The reason of the great difference of energy conversion factor is connected with energy consumption scale and change of CO2 emission energy unit consumption.