Studying the impact of foreign trade on carbon emissions and solving the contradiction between trade and environment in the process of economic development in China, both have the important strategic significance for China to speed up the construction of resource saving and friendly environmental society. The factor decomposition method was used in this paper, which chose three time point data of year 2003, 2007 and 2011. The method was applied to quantitative analysis and the impact of major industries' export on carbon emissions from three levels of scale effect, structural effect and technological effect. It proved that the scale effect and the structural effect on the export trade in carbon emissions are positive, but the technological effect is negative in the first calculation period. However, the three effects are all negative in the second calculation period.