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This paper employs input-output structural decomposition analysis (IO-SDA) to explore the driving factors of Beijing's energy intensity, including energy input coefficient, technology coefficient (Leon- tief inverse coefficient), final demands structure by product, final demands by category, and final energy consumption coefficient. Based on the constant price energy-input-output tables from 1997 to 2012, the analysis results show that 1) in general, Beijing's energy intensity declined gradually; 2) the major driving factors were energy input coefficient and final demands by category; 3) the impacts of energy input coefficient and technology coefficient on energy-intensity decrease varied positively or negatively with time; 4) the impact of final energy consumption coefficient was somewhat weak. [ABSTRACT FROM AUTHOR]