Abstract: The distribution of responsibilities for carbon emission reduction for different regions is a hard nut to crack for the energy-saving and emission-reduction policy. To determine regional responsibilities for carbon reduction, this paper applied the input-output method, and calculated the embodied CO2 in regional trades. Aiming at providing quantitative references for the government, it determined the regional proportion of responsibility from the perspective of common shared environmental responsibility, and apportioned the 2020 emission reduction target of China. The main results show that: there is a basic characteristic in the transfer of carbon emission, that is, from the resource-rich regions to the developed coastal regions and from the coastal regions to the central regions. The amount of carbon emission reduction increases along with the increase of economy in 2006-2020; the central regions are allocated the largest task of reducing emissions, while the Beijing and Tianjin region is allocated the least. In order to achieve the overall emission reduction targets, China should give financial subsidies to the central and northwest regions, encourage the structure adjustment of industrial and trade, eliminate backward production models and improve the carbon intensity. At the same time, it is very important to encourage the coastal regions to support the energy rich regions by capital, technology and personnel.