a　new　type　of　near　α　high　temperature　titanium　alloy　of　Ti-Al-Sn-Zr-Mo-Si-Er　was　studied.　The　samples　with　different　primary　α　phase　content　were　prepared　by　solid　solution　at　950　℃/1　h—1010　℃/1　h.　The　multi-step　hot　compression　experiments　were　carried　out　by　Gleeble-3500　in　a　sequence　of　upper　region　of　α　+　β　phase,　followed　by　lower　region　of　α　+　β　phase.　The　effects　of　primary　α　phase　content　and　deformation　temperature　on　the　microstructure　of　the　alloy　were　studied　by　means　of　true　stress-strain　curve　and　optical　microscope.　The　results　showed　that　the　content　of　primary　α　phase　gradually　decreased　from　45.4%　at　950　℃　to　0%　at　1010℃.　As　the　deformation　temperature　decreased　from　940　℃　to　900　℃,　the　content　of　α　phase　increased　gradually　from　65%　to　94%,　which　was　changed　from　dynamic　recrystallization　to　deformed　structure　elongated　along　RD　direction.　It　was　found　that　the　arrangement　of　α　phase　along　RD　direction　was　the　longest　at　920℃.　With　the　deformation　temperature　in　the　multi-step　high　temperature　region　increased　from　970　℃　to　990　℃,　the　width　of　deformed　α　phase　decreased　from　3.64　μm　at　970　℃　to　2.71　μm　at　990　℃.　The　optimized　microstructure　is　composed　of　20%　primary　α　phase　arranged　along　RD　direction.　This　process　has　a　certain　potential　in　the　process　of　hot　deformation　of　the　alloy.　©　2021　Trans　Tech　Publications　Ltd,　Switzerland.