Abstract: TA15 titanium alloy is widely used in the aviation field due to its superior mechanical properties. This study investigates the mechanical properties of TA15 titanium alloy under wide strain rates. By examining the fundamental mechanical properties of TA15 titanium alloy and considering the influence of stress triaxiality, strain rate and temperature on its deformation and failure behavior, this study conducts quasi-static, high-speed tensile and dynamic tensile tests on alloy smooth specimens and notched specimens under both ambient and high temperature conditions. The results demonstrate that the strength and plasticity of TA15 titanium alloy show different changing trends under varing stress states, and the fracture strain decreases with increased stress triaxiality. In the quasi-static/dynamic tensile test, TA15 titanium alloy exhibits a strain rate strengthening effect. In the high-temperature tensile test, TA15 titanium alloy shows obvious temperature softening effect, with a gradual decline in strength upon heating, while its plasticity is relatively unaffected by temperature variations. The findings in this work can provide a basis for the constitutive relationship and simulation calculation of TA15 titanium alloy.