On the basis of studying the real-time database technology, combined with CC-2000A system of Kedong company, the CASE management functions is being developed, which improved the history data processing method in the real-time database of SCADA (Supervisory control and data acquisition systems). It can achieve the goal of preserving, recovering and deleting the entities of real-time database, graphics and the results of state estimation, which being provided for the EMS (Energy Management System) to do research on the calculation of historical data.