作为全球第一大碳排放国家，中国的碳减排行为正受到全世界广泛关注。因此，清楚地了解中国对外贸易中的产品隐含碳情况，不仅有利于国家从贸易角度控制碳减排，而且对于国家应对未来可能出现的碳关税和贸易壁垒、在国际气候谈判中争取更多权利都具有重要的现实意义。本文通过构造非竞争性投入产出表，将中国2007年投入产出表135个产品部门整理合并为43个部门，结合能源统计年鉴等数据计算得到中国2007年各部门进口与出口隐含碳。其中进口产品的碳排放强度根据2007年进口来源国家的进口份额加权平均计算得到。考虑到加工贸易的较大份额，由KWW方法计算出的垂直专业化水平来确定进口产品的中间投入系数矩阵，从而通过投入产出模型计算出口产品中的国内附加值与国外附加值。在计算出中国2007年进出口隐含碳净值后，根据对数均值迪氏指数法（LMDI）将其影响因素分解为贸易规模效应、贸易结构效应以及完全碳排放强度效应，并分别给出了是否考虑加工贸易下的不同结果。计算结果表明，我国2007年国内生产碳排放6635.61百万吨（Mt），其中35%的碳排放用于生产出口产品，即国外最终需求要对我国35%的碳排放负责。2007年我国进口隐含碳共计1530.75Mt，其中用于国内生产投入1508.02Mt，占总进口隐含碳的98%，包括加工贸易生产投入318.07Mt和正常生产投入1189.96Mt，这说明我国进口隐含碳有98%用于国内再生产，只有2%用于国内最终消费。2007年我国出口隐含碳共计2185.8Mt，其中加工贸易出口633.26Mt，约占总出口隐含碳30%。总体来看，我国是一个隐含碳净出口国，2007年净出口隐含碳为655Mt，约占国内总碳排放的十分之一，进出口隐含碳较为失衡。 43个部门中共有30个部门为隐含碳净出口部门，11个部门为隐含碳净进口部门。利用LMDI方法将2007年中国进出口隐含碳净值影响因素分解，得到贸易规模效应贡献率为89.03%，为减少进出口隐含碳的失衡我国应适度扩大进口，尤其是最终消费品的进口规模；贸易结构效应贡献率为-23.69%，说明我国目前贸易结构对国内碳减排较为有利，但仍存在优化空间；完全碳排放强度效应为34.66%，说明我国应提升能源利用率并提升清洁工艺，从源头控制碳排放。在不考虑加工贸易的条件下，贸易规模效应为77.82%，贸易结构效应为-19.34%，完全碳排放强度效应为41.52%。加工贸易的存在增强了贸易规模的正效应和贸易结构的负效应，减弱了完全碳排放正效应。

As the biggest carbon emitter, China is now facing the pressure of reduction carbon emission from all over the world. The clear understanding of embodied carbon in China’s foreign trade can help China control carbon emission from trade aspect, as well as stay an advantage in the future international climate negotiation. Also it could help China find solutions to possibly appeared carbon tariff and relevant trade barriers. This study applies a non-competitive input-output technique, merge and assort 135 departments into 43. Combined with China 2007 Input-Output Table, Energy Statistical Yearbook 2008 and data from IPCC and EIA, this study gives a more precise calculation of carbon embodied in China’s 2007 foreign trade. The total carbon emission intensity of imported goods is a weighted average of main source countries of imports. Considering big share of processing exports, the intermediate input coefficient matrix of imported goods is obtained from KWW method, and then we get the domestic added value and foreign added value of exports separately. After the calculation of net embodied carbon flow, we decompose its influencing factors into three effects through LMDI approach: activity effect, structure effect and carbon emission intensity effect. We also compared the results with situation when processing exports are not taken into consideration.The calculation results show that China’s total domestic carbon emission in 2007 was 6635.61Mt, 35% of which was used in exported goods production, including 315.19Mt for processing exports and 2028.81Mt for non-processing exports. Carbon embodied in China’s imports in 2007 was 1530.75Mt, 1508.02Mt (98%) of which was used in domestic intermediate input, including 318.07Mt input for processing exports and 1189.96Mt for others. Carbon embodied in China’s exports was 2185.8Mt, of which processing exports occupied 633.26Mt at around 30%. In general, China was a net exporter of embodied carbon in 2007 with a net embodied carbon export flow of 655Mt, occupying 10% of total domestic carbon emission. Of all 43 departments, 30 departments were net embodied carbon exporter and 11 were net importer, while 2 departments had no trade flows.The results of LMDI decomposition in China’s 2007 net embodied carbon flow show that activity effect could explain 89.03%, which means we should enlarge our import scale properly, especially import of final consumption goods. Structure effect accounted for -23.69%, indicating that current trade structure is good for carbon balance but could still be improved. Carbon emission intensity effect was 34.66%, showing that clean energy technology plays an important role in embodied carbon trading balance. So improving our clean technology and energy utilization ratio will contribute to reducing domestic carbon emission. When processing trade was not taken into consideration, activity effect accounted for 77.82%, structure effect was -19.34% and carbon emission intensity effect was 41.52%. This indicates that processing exports strengthen the effect of activity and structure, but weaken the effect of carbon emission intensity.