It is noted that the power dispatching automation system is in general a distributed system， in which there are a lot of one-to-many， many-to-many message communications. Owing to the systems own characteristics， common message-oriented middleware products cannot meet its actual demands. Based on an analysis of the characteristics of message-oriented middleware in the dispatching automation system， including reliability， scalability， timeliness， multi-context supporting and so on， a new message-oriented middleware fit for the dispatching automation system is proposed， with an all-round description of its key technologies and implementation provided. The middleware has found application in many power dispatching automation systems.