Reliable multicast is a useful network service but challenged by the Internet heterogeneity and the nonsupport of IP Multicast in wide-area Internet. In this paper, an application-level semantic reliable multicast (ASRM) is presented, which realizes application-level semantic reliable multicast data delivery. ASRM uses a hybrid way that combines unicast delivery with multicast delivery instead of using global IP multicast as the basis. ASRM provides a simpler and more natural way to name and locate the sessions.During the data forwarding,ASRM can use application-defined semantics to transcode content according to the transcoding models,rules and user'preferences.Thus,it can cope with the heterogeneity problem very well.ASRM is suitable for wide-area, limited scale,reliable multicast applications.