Sliding　velocity　has　a　direct　impact　on　friction　heat　and　contact　situation.　Frictional　heating　and　associated　temperature　seriously　affects　the　material　chemical　and　physical　-　mechanical　properties,　and　is　one　of　the　direct　factors　on　the　wear　mechanism.　To　analyze　the　influence　of　the　sliding　speed　on　the　maximum　contact　temperature,　contact　pressure,　stress,　etc,　a　3D　thermo-mechanical　coupling　model　for　the　rough　surface　frictional　sliding　is　established.　The　rough　surface　is　characterized　based　on　fractal　theory.　The　model　considers　friction　contact　between　an　elastic　flat　plane　and　an　elasto-plastic　rough　surface.　Also,　the　model　integrates　the　heat　flux　coupling　between　the　sliding　surfaces　and　allows　the　analysis　of　the　effects　of　elastic-plastic　deformation　of　rough　body　and　the　interplay　among　asperities.　The　numerical　results　from　the　analysis　and　simulation　show　that　the　maximum　contact　temperature　increases　with　the　increasing　of　the　sliding　velocity.　But　the　maximum　Von　Mises　equivalent　stress　and　the　maximum　contact　pressure　have　few　relationships　with　sliding　speed.　They　may　increase　or　reduce　with　the　sliding　velocity　increasing.　Some　results　are　validated　by　research＇s　results　available　in　the　literature.　©　(2010)　Trans　Tech　Publications,　Switzerland.