TB9 alloy has superior strength effect through heat treatment and high corrosion resistance as metastableβtitanium alloy. The effects of solution treatment and solution followed by aging treatment on mechanical properties and microstructure of TB9 alloy were studied in this paper. The results indicate that the strength gradually decreased and the change of ductility was not obvious after solution treatment between 800℃and 900℃. The βgrains size quickly increased with the solution treatment temperature above 820℃. The influence on strength of TB9 alloy was not distinct after solution between 800℃and 900℃ and aging treatment, while the ductility obviously droped with the solution treatment temperature increasing,the elongation droped from 15% to 10% and the reduction of area droped from 37.5% to below 20%.The α phase adequately precipitated and the mechanical properties was steady after solution and aging treatment (820℃/30min、WQ+520℃/8h、AC)