In order to meet the requirements of building CORBA-based distributed multimedia applications, OMG has defined the CORBA A/V Stream Service Specification. However, it is not specified to use what network mechanism to ensure the QoS of multimedia streams. In this paper, an implementation model of IntServ/RSVP based CORBA A/V Stream Service is proposed. It first maps the application-level QoS parameters of multimedia streams specified by application developers into network-level QoS parameters. It then negotiates the QoS requirements with the IntServ/RSVP enabled network and reserves corresponding network resource in the end-systems and intermediate network systems to maintain end-to-end QoS enforcement through the RSVP API. In addition, developers can flexibly control and manage the multimedia streams using CORBA IIOP protocol.