The changes in economic structure decreased AHU-377 average of 8.66 Mt of CO2 emissions annually during the 1993–2011 period. However, there were discrepancies between different sub-periods. In specific, changes in the economic structure resulted in an average annual decrease of 46.29 Mt, 30.86 Mt and 21.17 Mt during the first, second and fourth stage, respectively, but an average annual increase of 69.50 Mt during the third stage (Fig. 6). These results were caused by different changing trends of economic structure during different stages. In fact, the proportion of MEIs in manufacture industry declined continuously from 26.50% to 19.50% during the entire study period. The proportion of LEIs continuously grew during the first and second stages (from 40.53% to 48.42%), and then fluctuated around 47.40%. The proportion of HEIs fluctuated decreasing before 2003 (from 32.97% to 28.21%), increased during 2003–2007 (from 29.25% to 33.51%), and then maintained stability during 2008–2011. Sector-level analyses reveal the following: (1) the proportion increase mainly occurred in sectors C21, C37, C39, C40 and C41; (2) the proportion decrease mainly occurred in sectors C15, C17, C28, C29 and C42; (3) the proportion rebound of HEIs mainly attributed to the development of sector C32 and C33. In summary, sectors in HEIs groups, particularly C32 and C33, deserve more attention during industrial restructuring. This conclusion will provide the basic foundation for the Chinese government to adjust industry policies, because structure adjustment based on industrial carbon emissions is better than that based on the Chinese Industrial Restructuring Catalog (Mao et al., 2013).