Abstract: SP-700 titanium alloy was treated by solid solution in β phase region at 1 000℃ for 15 min, and then was cooled to (α+β) phase region for solid solution at different temperatures (650-900℃) for different times (3-10 min) or was treated by single stage aging and or double stage aging including 280℃ low temperature pre-aging and the second aging at different temperatures (370-650℃) for different times (15, 90 min). The microstructure and properties of the alloy under different processes were studied. The results show that the volume fraction of α phase in the alloy after 850℃ solid solution increased with the solid solution time; when the solid solution time was 5 min, the alloy had good strong plastic matching. Under solid solution time of 5 min, the volume fraction of α phase decreased with increasing solid solution temperature; when the solid solution temperature was 650℃, the alloy had good strong-plastic matching. After β phase region solid solution and single/double stage aging, the alloy was basically composed of β grain, α phase and acicular martensite. After single stage aging at aging temperature of 650℃ for 90 min or double stage aging at aging temperature of 650℃ for 15 min, the alloy showed good strong-plastic matching.