The paper analyzes the impact of industrial structure on carbon intensity, by modeling from the perspective of both horizontally and vertically. The empirical results show that the industrial structure and energy consumption structure have a greater impact on the changes of carbon emissions; The provinces, whose proportion of secondary industry in the economy is high or coal consumption accounts for a large proportion, usually have a higher carbon intensity, and by adjusting and optimizing industrial structure and energy consumption structure, it could reduce the carbon intensity effectively; The second industry has big contributions to the whole communitys carbon intensity, and changes in the internal structure of the second industry that has a greater impact on carbon intensity. Therefore, this paper points out that our research on the carbon intensity should focus on the implementation of structural energy saving, from adjusting industrial structure, eliminating backward production capacity of the industry, actively carrying out industrial transfer, and improving the energy structure in order to achieve national objectives of carbon emission reduction.