Abstract: The surface integrity of titanium alloy TC17 machined by ball-end cutters was studied. According to the specific ball-end milling experiments and surface integrity test experiments, it is concluded that under the given experimental conditions, the surface roughness Ra increases with the increase of the feed per tooth f_z, while the influence of cutting speed v_c on surface roughness and surface micro-morphology is not significant. The surface of titanium alloy TC17 machined by ball-end cutters also showed a state of residual compressive stress, and the specific variation range was -250~-450 MPa; the micro hardness and residual compressive stress of the machined surface decrease with the increase of v_c, and increase with the increase of f_z, whose main reason is that as v_c increases and f_z decreases, the thickness of the plastically deformed layer on the milled surface gradually decreases.