Abstract: The flow behavior of 2219 aluminium alloy was studied by single pass hot compression at the temperatures of 200-350℃ and strain rates of 0.1-10.0 s^-1 with Gleeble-3180 thermal mechanical simulator. The flow stress constitutive equation of 2219 aluminum alloy during hot compression was established and verified by experiments. The results show that the flow stress of 2219 aluminum alloy increased with the increase of strain rate or the decrease of deformation temperature. The change rule of stress calculated by Fields-Backofen constitutive equation was the same with that by experiments, and the relative error between calculated and tested stresses was less than 5%. The constitutive equation described the high temperature flow behavior of 2219 aluminium alloy accurately.