Abstract: The tensile properties of TC11 titanium alloy at different temperatures were tested, and the effects of tensile temperature on the microstructure and properties of the alloy were analyzed by optical microscope, scanning electron microscope and X-ray diffractometer. The results show that in the high temperature tensile test, the strength of the alloy is generally low, while the plasticity is high, and with the increase of tensile temperature, the strength of the alloy decreases continuously, but the plasticity increases. Compared with the original forged structure, the size of the primary α phase grains at high temperature tensile fracture position is obviously coarsened. With the increase of the tensile temperature, the structure is still dominated by long strip primary α phase, but the content of fine equiaxed α phase increases. The fracture morphology after tensile at different temperatures is similar, which is composed of a large number of dimples.