Abstract:

The aim of present article is to analyze comparatively the differences and causes of energy use efficiency of seven provinces and two cities(Sichuan Province，Chongqing City，Hunan Province，Hubei Province，Jiangxi Province，Anhui Province，Zhejiang Province，Jiangsu Province and Shanghai City) in the Yangtze River valley and find the way to improve energy use efficiency.First，the article defines the energy use efficiency as technical efficiency realized by elements optimization configuration；then，data envelopment analysis(DEA) and stochastic frontier approach(SFA) will be used as measurement methods；last，after comparing the advantages and limits of Laspeyres index with Divisia index，the latter method will be used to decompose the affecting factors of energy use efficiency.The GDP energy consumption，energy technical efficiency and energy use efficiency of the above mentioned seven provinces and two cities and six branches from 1997 to 2006 were calculated，and the influencing degree that structure adjustment，technological progress and system evolution impose on energy efficiency were analyzed.(1) Structure adjustment is the forceful measure to improve energy use efficiency；(2) Technological progress and system evolution are the key to improve energy use efficiency；(3) Research method about energy use efficiency should be unified as possible as we can and continuously improved.

Key words: energy use efficiency/ energy use efficiency estimating/ factor decomposition/structural adjustment/ technological progress