This paper uses input/output theory and structural decomposition to analyze the dynamic evolution and mechanism of energy consumption before and after financial crisis in Guangdong province. The reason in energy consumption increment in Guangzhou province mainly lies in economic growth and population size, and it had been slowing down after financial crisis due to a declining energy consumption intensity, adjusting final demand structure and improving producing structure. Internal exports are the major driving force contributes to the energy consumption increment, largely impacted by gross fixed assets and urban resident consumption after financial crisis. Input/output analysis reveals that domestic transfer in contributing to the gross energy consumption reduction is outstandingly less international imports.