Abstract: The effects of different solution temperatures on the microstructures and mechanical properties of TA19 titanium alloy were studied by means of heat treatment at different solution temperatures and the same aging temperature. The results showed that the solution temperature had a significant effect on the content of primary α phase of TA19 titanium alloy microstructure. When TA19 titanium alloys were solution treated by at 10℃ to 50℃ bellow T_β for 1 h, blowing cooling and then were aged at 595℃/8 h, air cooling, their room temperature and high temperature mechanical properties could meet the requirements of AMS 4975 standard. The overall properties of TA19 titaniam including mechanical properties at room and high temperatures and creep properties were the best when the alloy was treated by Tβ-10℃/1 h, blowing cooling + 595℃/8 h, air cooling, and then its content of primary α phase was 15%~18%.