Abstract: TA19 titanium alloy was treated by solid solution at different temperatures (930, 960, 990℃) for 2 h and then aging at different temperatures (550, 590, 630℃) for 8, 16 h. Effects of process parameters on microstructure and tensile property were studied. The results show that after solid solution at different temperatures and then aging at 590℃ for 8 h, the equiaxed α phase content in the test alloy decreased and the tensile strength was improved with the rise of solid solution temperature. After solid solution at 960℃ for 2 h, the microstructure of the test alloy was composed of equiaxed α phase and α' martensite. During the subsequent aging at 550℃ for 8 h, α' martensite decomposed unsufficiently, so the content of granular α phase was relatively small and therefore the tensile strength of the alloy increased limitedly. When the aging temperature rose to 590℃ and the aging time was 8 h and 16 h, fine and diffuse granular α phase precipitated in the microstructure, resulting in the increase of tensile strength. When the aging temperature continuously increased to 630℃, the α phase was coarsened and the tensile strength decreased.