Abstract: Tensile tests at 25-175℃ were carried out on 2297-T87 Al-Li alloy. The effect of temperature on tensile property of the alloy were studied and the microtructures after tensile were observed. The results show that with the increase of temperature, the tensile strength and yield strength of the alloy decreased, and the elongation increased. When the temperature rose to 175℃, the tensile strength and yield strength of the alloy were 77.72% and 82.03% of the tensile strength and yield strength at room temperature(25℃), and the alloy still had relatively high strength. The microstructures of the alloys were similar, and they were mainly composed of rolling deformed grains and a small amount of fine recrystallized grains.