Abstract: The high-temperature tensile test of 6061 aluminum alloy sheet was carried out, and the effects of different tensile temperatures and strain rates on its microstructure and mechanical properties were studied. The results show that at a tensile temperature of 350℃, fine recrystallised grains appear in the microstructure. The number of reinforcing phases in the 6061 aluminum alloy microstructure is related to the strain rate. At a tensile temperature of 250℃, the number of second-phase particles decreases as the strain rate decreases. At a constant strain rate, the tensile strength of the 6061 aluminum alloy decreases with the increase of the tensile temperature; at a constant tensile temperature, the tensile strength of the aluminum alloy rises with the increase of strain rate. At a temperature of 350℃ and a strain rate of 10^-3s^-1, the maximum elongation after break is 50.35% and the minimum tensile strength is 51 MPa. 6061 aluminum alloy fracture has a large number of dimples, the morphology is toughness fracture. With the increase of tensile temperature and the decrease of strain rate, the fracture has more dense density, deep depther, and better plasticity. Reduced strain rate and increasing deformation temperature can enhance material plasticity.