Abstract: This paper mainly studies the effects of different heat treatment processes on the microstructure and mechanical properties of Ti175 alloy.Ti175 samples were heat-treated using various heat treatment temperature.Followed by testing and analysis of the samples' metallographic structure and mechanical properties.The results show that different first annealing temperatures have a significant impact on the metallographic structure and mechanical properties of the material: as the first annealing temperature decreases, the room-temperature and high-temperature strength of Ti175 decrease gradually, while its plastic toughness increases significantly.From the metallographic perspective, the primary α-phase increases with the reduction of the first annealing temperature.In contrast, the second annealing temperature has no obvious effect on the material's metallographic structure, room-temperature tensile properties, or high-temperature tensile properties—only the room-temperature impact toughness increases with the rise of the second annealing temperature.The conclusion analysis suggests that a higher first annealing temperature leads to more dissolution of alloying elements and primary α-phase into the matrix, and these dissolved components fail to precipitate in time during cooling.This results in a reduction in the primary α-phase and an increase in solution strengthening, thereby causing an increase in strength and a decrease in plastic toughness.Based on the research in this paper, it is concluded that Ti175 can achieve excellent comprehensive properties when subjected to the following heat to a temperature at 30℃ below the β transus for 2 hours followed by air cooling; the second annealing is carried out at 540℃ for 6 hours followed by air cooling.