The　served　harsh　environment　of　advanced　aircraft　engine　puts　forward　higher　requirements　for　high　temperature　titanium　alloy　performance.　The　optimized　heat　treatment　technology　provides　practical　guide　for　improving　the　microstructure　and　properties　of　high　temperature　titanium　alloys.　In　this　paper,　the　influence　of　different　heat　treatment　systems　on　microstructure　and　mechanical　properties　of　high　temperature　alloy　with　equiaxed　structure　was　studied,　in　order　to　obtain　the　corresponding　relationship　between　the　process　and　the　microstructure　performance　of　the　alloy　and　the　optimal　heat　treatment　process.　The　effect　of　solution　treatment　on　the　primary　alpha　phase　quantitatively　was　analyzed　by　optical　microscope　and　Image-Pro-Plus　6.0　software　based　on　the　forged　high　temperature　titanium　alloy　in　alpha+beta　phase　region.　The　precipitation　of　α2　phase　and　silicide　was　observed　by　TEM,　and　the　aging　process　was　optimized　according　to　hardness　test.　The　results　show　that　the　content　of　primary　alpha　phase　decreases　from　63.3%　at　920　°C　to　15.3　%　at　990　°C　with　the　increase　of　solution　temperature.　Lamellar　structure　appears　when　the　solution　temperature　raises　to　1010　°C.　The　secondary　alpha　phase　precipitates　more　fully　when　the　aging　temperature　increases.　With　increasing　aging　time,　the　trend　of　α2　phase　growth　becomes　more　significantly.　The　optimum　heat　treatment　system　obtained　in　this　experimental　is　990　°C/1h/AC+700　°C/5h/AC,　and　the　alpha　phase　is　about　15.3　%.　Hence,　the　excellent　microstructure　and　properties　matching　has　been　obtained　in　this　way.　©　2019　Trans　Tech　Publications,　Switzerland.