With the development of industrial technology and the rising of energy issues, aluminum alloys have become one of the preferred lightening materials for low weight, good corrosion resistance, good forming and processing properties. Taking 5A02 aluminum alloy cold-rolled sheet as the research object, the plastic deformation behavior of 5A02 aluminum alloy under different temperatures and strain rates were analyzed through uniaxial tensile test and metallographic test. Combined with experimental data and Zener-Hollomon parameter model, the constitutive model of 5A02 aluminum alloy under high temperature conditions was studied. The results show that the strain rate and deformation temperature have a great influence on the elongation when the 5A02 aluminum alloy is deformed under high temperature conditions. At strain rates of 0.01s-1, 0.001s-1, 0.0005s-1 and 0.0001s-1, the elongation of 5A02 aluminum alloy is greater than 100% when the deformation temperature is above 250°C. The true stress-strain curve of 5A02 aluminum alloy is characterized by dynamic recovery when the deformation temperature is 150°C~250°C, and the flow stress curve has obvious softening phenomenon when the deformation temperature is above 250°C.