Abstract: In this paper,the energy social accounting matrix of China for 2005 has been established,and the energy SAM model has been constructed and applied to analyze the impacts of four trillion RMB investmenu on total production,GDP,energy requirement,and energy consumption per GDP under two scenarios which are with constant energy efficiency and improved energy efficiency.The empirical results show that,in the constant energy efficiency scenario,this investment will promote GDP increase by 5970.2 billion RMB and energy requirement by 5273.9 ton of standard coal,and energy consumption per GDP decrease by 4.932%which is the effect of industry structure optimization,andindustrial structure optimization;andintheimproved energy efficiency by 5% scenario,this investment will promote.P increase by 5979.5 billion RMB and energy requirement by 5121.2 ton of standard coal,and energy consumption per GDP decrease by 5.419%,which is the joint effect of industry structure optimization and technology improvement.

Key words: Social Accounting Matrix, Energy Social Accounting Matrix model , investment , energy requirement