A　three　dimensional　fully　thermal-mechanical　coupled　finite　element　model　had　been　presented　to　simulate　and　analyze　the　cutting　temperature　for　high　speed　milling　of　TiAl6V4　titanium　alloy.　The　temperature　distribution　induced　in　the　tool　and　the　workpiece　was　predicted.　The　effects　of　the　milling　speed　and　radial　depth　of　cut　on　the　maximum　cutting　temperature　in　the　tool　was　investigated.　The　results　show　that　only　a　rising　of　temperature　in　the　lamella　of　the　machined　surface　is　influenced　by　the　milling　heat.　The　maximum　temperature　in　the　tool　increases　with　increasing　radial　depth　of　cut　and　milling　speed　which　value　is　310　degrees　C　at　a　speed　of　60　m/min　and　increases　to　740　degrees　C　at　400m/min.　The　maximum　temperature　is　only　effective　on　a　concentrated　area　at　the　cutting　edge　and　the　location　of　the　maximum　temperature　moves　away　from　the　tool　tip　for　higher　radial　depths　of　milling.　The　predicted　temperature　distribution　during　the　cutting　process　is　consistent　with　the　experimental　results　given　in　the　literature.　The　results　obtained　from　this　study　provide　a　fundamental　understanding　the　process　mechanics　of　HSM　of　titanium　alloys.