Mechanism relation between fixed assets investment (FAI) and energy consumption in our country was analyzed. It is found that large-scale FAI is the main reason why the energy consumption rises, and there is a recycle relation between the FAI and energy consumption. An empirical research of the FAI and energy consumption was made by the panel data model in eight main industries. The result indicates the FAI causes Granger's reason of the energy consumption growth and the positive relation between FAI and energy consumption. Some political advices of how to prevent the energy consumption increasing.