Modeling　Hybrid　Avatar　and　Virtual　Actor　is　an　important　work　having　very　important　influence　on　the　overall　collaborative　virtual　environment　for　they　are　considered　as　key　elements　of　communication,　collaboration　and　interaction.　This　paper　analyzed　modeling　requirements　which　are　divided　into　two　types:　body　and　brain　requirements.　To　satisfy　brain　requirements,　keystone　of　modeling　work,　role　scheme　and　agent　technology　are　employed.　Hence,　This　paper　analyzed　relationship　among　role,　agent　and　brain　requirements　to　assure　that　combining　role　theory　with　agent　technology　is　feasible　to　model　Hybrid　Avatar　and　Virtual　Actor　with　all　brain　requirements　satisfied.　The　paper　also　presented　a　role　based　agent　oriented　model　for　Hybrid　Avatar　and　Virtual　Actor,　which　is　an　integrated　package　of　body　part　and　brain　part　that　cooperate　with　each　other.　The　body　part　contains　a　graphic　representation　and　a　set　of　interfaces　provided　to　the　brain　part　which　is　role-based　and　agent-oriented.　©　2004　IEEE.