Abstract: Titanium alloy possesses excellent physical and mechanical properties and is widely applied in aerospace, national defense, and military industries. This paper conducts simulation and relevant experiments on the tool motion curve during orthogonal high-speed turn-milling of TC11 titanium alloy, and investigates the surface morphology of titanium alloy in orthogonal high-speed turn-milling. The results show that the morphology of the workpiece surface varies with the milling-to-turning speed ratio. When the milling-to-turning speed ratio is relatively low, the workpiece surface presents group-pit morphology. As the milling-to-turning speed ratio increases, the workpiece surface transforms from group-pit morphology to fish-scale morphology. When the milling-to-turning speed ratio is relatively high, the workpiece surface morphology is close to the parallel-groove morphology formed by conventional turning. The research results provide technical support and reference for precision machining of titanium alloy components.