Abstract: As one of the main raw materials for aerospace equipment fasteners, TB9 titanium alloy's processing performance directly affects the service reliability of fasteners. In order to explore and optimize the influence of different cutting parameters on the machining quality of TB9 titanium alloy bolt shank, a 28 kHz high-frequency ultrasonic turning process was adopted. The corresponding relationship between different cutting parameters and cutting force, cutting temperature, and surface roughness was studied, and the failure mechanism of tool wear was revealed. The research results showed that feed rate and cutting amount had a significant impact on cutting force, with the maximum main cutting force being around 280 N. The cutting amount and cutting speed have a significant impact on the temperature of the cutting tool, with a maximum temperature of 309 ℃. At 800 r/min, the surface roughness of the sample significantly increased to 0.65 μm. The main manifestations of tool wear are abrasive wear and adhesive wear, among which the formation of chipping and chip deposits on the tool surface affects the increase of surface roughness.