The　effect　of　the　primary　α　content　and　precipitate　on　the　creep　resistance　of　a　high-temperature　titanium　alloy　with　a　small　amount　of　Hf　addition　were　studied.　The　microstructures　with　different　primary　α　contents　were　prepared　by　the　heat　treatment　of　920~1010　°C　/1　h+700　°C/5　h,　and　the　creep　test　(600　°C/150　MPa/100　h)　was　carried　out.　The　interaction　between　the　precipitation　phase　and　the　dislocation　configuration　was　analyzed.　The　results　showed　that　with　the　increase　of　solution　temperature,　the　volume　fraction　of　primary　α　phase　decreased　from　44.9%　at　920　°C　to　0%　at　1010　°C,　and　the　steady　state　creep　rate　of　the　alloy　decreased　from　60.60×10-4%/h　to　3.72×10-4%/h,　indicating　that　the　creep　property　was　significantly　improved　with　the　decrease　of　solution　temperature.　The　basket　structure　with　optimal　creep　resistance　was　obtained　under　the　heat　treatment　of　1010　°C/1　h+700　°C/5　h.　It　is　believed　that　during　the　high　temperature　creep　test,　the　precipitated　α2　phase　and　the　hafnium-containing　silicide　hinder　the　dislocation　motion　in　α　crystal　and　the　phase　boundary,　thereby　improving　the　creep　resistance　of　the　alloy.　©　2020　Trans　Tech　Publications　Ltd,　Switzerland.