Abstract: Hot compression tests were conducted on 2219 aluminum alloy at deformation temperatures of 330-450 ℃, strain rates of 10^-2-10 s^-1, and compression deformation of 60% on a Gleeble-3500 thermal simulation machine, and the dynamic recrystallization behavior during hot deformation was studied. Through analysis and fitting of the experimental data, the thermal deformation characteristic parameter model based on the Z parameter, the dynamic recrystallization kinetic model based on the improved Avrami equation, and the dynamic recrystallized grain size model based on deformation temperatures and strain rates were established. The results show that at a low strain rate and a high deformation temperature, 2219 aluminum alloy was more prone to dynamic recrystallization. According to the dynamic recrystallization kinetic model, the optimal hot working conditions were determined as a strain rate of 0.1 s^-1 and a temperature of 360 ℃. Under this condition, the dynamic recrystallization degree of 2219 aluminum alloy was the highest. The prediction accuracy of the dynamic recrystallized grain size model was high, and the linear correlation coefficient reached 0.95.