Abstract: Titanium alloy is the main raw material of aviation fasteners, and its processing performance directly determines the service performance of aviation fasteners, which in turn affects the reliability of aviation equipment. Improving the machinability of titanium alloys is an effective way to improve aerospace fasteners. The research takes TB9 high-strength titanium alloy as the research object, and mainly compares the differences in main cutting force, surface machining morphology and tool wear characteristics between conventional cutting and ultrasonic cutting. The results show that compared with conventional cutting, ultrasonic cutting effectively reduces the cutting fluctuation and cutting force during the cutting processd; In addition, the mechanical scratch depth caused by ultrasonic cutting is reduced by 61.34 %. With the increase of ultrasonic amplitude, the surface processing quality of the TB9 titanium alloy sample is significantly improved. Moreover, the degree of oxidation wear of cemented carbide tools is reduced.