Abstract: A kind of ORB core structure is provided in this paper, which makes application developers deploy their distributed applications according to management domains and provides a different network port for each management domain, through analyzing the roles in ORB core based on the reactive agent model and the semantics definition of processing states of POA in CORBA specification. Based on the structure above, the techniques to implement the stream control in CORBA platforms are discussed. Moreover, the mechanism and algorithm of the stream control that can fairly schedule requests to execute by itself are designed, which can resolve the key problems in the stream control in CORBA platforms.