It　is　widely　believed　that　cooperative　relay　technologies　can　improve　the　throughput　of　multicasting　in　mobile　cellular　networks　significantly,　however,　the　mobility　of　the　relay　terminals　may　cause　frequent　relay　link　outage.　This　paper　proposes　a　stream　layered　cooperative　relay　scheme　to　deal　with　this　problem.　In　order　to　study　the　characteristics　of　layered　relay　channels　in　the　scheme,　the　capacity　region　is　determined　based　on　a　single　and　a　multi　relay　abstract　model　with　streams　layering.　Besides,　to　satisfy　the　cellular　network　scenario,　the　results　are　extended　to　a　wireless　Gaussian　channel　model.　The　analysis　and　simulation　results　show　that　the　scheme　guarantees　the　continuity　of　the　multicast　streams,　and　maintains　the　high　bandwidth　of　relay　channel,　with　a　slight　loss　on　system　capacity.　©　by　HIGH　TECHNOLOGY　LETTERS　PRESS.