SINO Carbon Intensity Index is an index system which is expressed as the carbon dioxide emis- sion per GDP and is designed to promote emission reduction. The index can effectively reflect the changes on carbon emission intensity in different administrative regions in time series. This paper discusses the influenc- ing factors of carbon emission intensity of Shanghai from 2005 to 2011, based on industrial structure, energy intensity, energy structure and policy & economic environment. It outlines activities accordingly to advance emission reductions in Shanghai. The result shows that the energy-saving target and low-carbon policy of Shanghai promoted the adjustment of energy structure, the optimization of industrial structure and the de- creasing of energy intensity; and then pushed forward the declining of carbon emission intensity of Shanghai and Xsh,y in recent years. While the economic crisis, “4 Trillion Yuan Economic Stimulus Plan”, Expo 2010 ShanghaiChinaand other major economic events and activities were the independent external factors which influenced the Xsh,y obviously.