Abstract: The thermal compression behavior of 304 austenitic stainless steel under the conditions of deformation temperature of 950-1 150℃ and strain rate of 0.05-1 s^-1was studied by Gleeble thermal simulator. According to the true stress-strain curve, the constitutive equation at high temperature was constructed based on Arrhenius model, and the processing map was established. Based on the experimental data, a dynamic recrystallization model was established, and the recrystallization behavior of the steel was simulated by Deform software, and was verified by test. The results show that the flow stress of stainless steel increased with increasing strain rate or decreasing deformation temperature. When the deformation temperature was 1 080-1 120℃, the strain rate was 0.05-0.2 s^-1, and the deformation temperature was 1 120-1 150℃, the strain rate was 0.5-1 s^-1, the steel had good hot working properties. When the deformation temperature was 1 000℃, the strain rate was 0.05 s^-1, and the deformation temperature was 1 100℃, the strain rate was 0.05 s^-1, the relative error of the recrystallization grain volume fraction in the sample center and grain size between simulation and test results was smaller than 7.62%, which verified the accuracy of dynamic recrystallization model.