Aiming at large-scale data collection points and intensive collecting characteristics of power users in our country, the demands on database of electric energy data acquire system are analyzed in the construction of smart grid. The construction plans of real time database in electric energy data acquire system are discussed from the system composition, technical architecture, database deployment, and the construction models etc. The program can ensure the reliability of data collection, enhance the agility of data applications, have universal data interface with plug and play, show the innovative application of data flow, and have the function of unique data nanny. The application of the construction plan is pre-research of implementing time-of-use(TOU) and makes the basis of guiding the social scientific and rational use of electricity.