The relational real-time databases are widely used in the energy management system（EMS）， in which the model data complying with the common information model（CIM） cannot be stored directly. To solve this problem， a prototype of object-oriented real-time database is proposed. First， the key techniques for developing an object-oriented real-time database are analyzed. Then， the Memento design-pattern and shared memory pool are adopted to implement this system. The data structure of the real-time database is introduced. In the last part of the paper， some numerical tests are performed to prove the effectiveness of this system in its initial application.