Abstract: Gleeble-3500 thermal simulation testing machine was used to conduct a simulation and compression study on GH4730 alloy.The selected deformation temperature was 1060-1160 ℃and the strain rate was 0.001-10 s^-1.By the obtained stress-strain data, the high-temperature rheological behavior of the alloy was analyzed.Based on the balance principle of work hardening, the dynamic recovery and dynamic recrystallization softening in the hot deformation of the alloy, the dynamic recrystallization evolution model was established. The dynamic recrystallization volume fraction model of the alloy is established. The results show that the Zener-Hollomo parameter is related to the peak strain showing a piecewise linear relationship, while the dynamic recrystallization critical strain has a single linear relationship with the peak strain.The dynamic recrystallization percentage increases in an S shape with the increase of strain. Higher deformation temperature and lower strain rate are beneficial to the occurrence of dynamic recrystallization.The experimental results of microstructure are in good agreement with the prediction results of the established model, which indicate that the established model can be used for the technological guidance of hot deformation of as-cast GH4730 alloy.