As the sequence of real time，continuous and orderly values collected by the phase measurement unit（PMU） and supervisory control and data acquisition（SCADA） is a typical data stream，the relational database management system（RDBMS） currently adopted in the energy management system（EMS） cannot satisfy the real-time characteristic and adaptability required. On the basis of the data stream model（DSM） developed，the frame of a data stream management system（DSMS） for EMS is proposed.The design can deal with the data streams classified in terms of different velocities of flow and fulfill the division and deceleration of high-speed data.So the frame can process the data from PMU and SCADA collaterally. In addition，the system can realize the dynamic monitoring and stabilization calculation at the same time.The basic architecture，the functions of each component part of DSMS and key techniques are described.Further ameliorative measures to improve the efficiency of data processing are given.