With the development of EHV and power network interconnection， the dispatching automation system trends with several features such as digitization， integration， grid technology， standardization， deregulation and intellectualization. The key of digitization technology is the realization of informatization in electric instruments， data acquisition， control and management. Integration technology emphasizes data sharing and data integration of different systems in dispatching automation system. Grid technology can be utilized to implement the incorporation of information saved dispersedly in hierarchical and distributing power dispatching management system. Standardization emphasizes plug-and-play. Deregulation refers to the supervisory control and analysis of trading in power market. Based on data integration technology， power system analysis and supervisory control can be raised to a completely automatic and intelligent level. The technological issues addressed on these features are analyzed in detail and the future development direction of the dispatching automation system is described.