Based on IEC 61970/IEC 61968 standards and real-time CORBA technologies， this paper presents a new solution to construct a common data platform in the power dispatcher centers step by step. Three aspects are studied， such as common data management， data access pattern， and interconnection among systems. The goal is to achieve the centralized modeling and maintaining of power system common data， enforce the integrity， security and maintainability of common information， and reduce the complexity and cost of interconnecting in different automation systems， and different power dispatcher centers.