Input-output modelling, which is characterised as a flexible analytical tool, is intensively used in life cycle assessment to estimate the environmental impact of production and consumption. In this paper, the extended Leontief input-output model is used to examine SO 2 emissions in China in 2007. Since direct and indirect SO 2 emissions from each sector can be quantitatively calculated by this model, the results would help uncover the relationships between the SO 2 emission transactions of different sectors. A series of indicators, including SO 2 emission multiplier, intersectoral total SO 2 emission intensity, and total SO 2 emission discharge percentage, are also determined to obtain a full understanding of SO 2 emissions in China.