Abstract: To investigate the microstructural evolution of GCr18Mo high-carbon chromium bearing steel during hot processing and to optimize its hot deformation parameters, single-pass hot compression experiments were performed using a Gleeble-3800 thermomechanical simulator to obtain the corresponding true stress-true strain curves. Under a 60% deformation reduction, the dynamic recrystallization (DRX) behavior was systematically investigated at strain rates ranging from 0.01 s^-1 to 10 s^-1 and deformation temperatures between 800 ℃ and 1 100 ℃. The empirical models for peak strain (ε_p) and critical strain (ε_c) associated with DRX are established, revealing a linear relationship of ε_c=0.55ε_p with correlation coefficients (R²) of 0.97 and 0.98, respectively. The apparent activation energy for DRX is calculated to be 53.85 kJ/mol. Analysis indicates that the solute drag effect caused by the addition of Mo is the primary reason for the increased recrystallization resistance. Based on the modified Avrami equation, the material constants are determined as β_d=0.63 and k_d=3.51, and a kinetic model describing the evolution of the DRX volume fraction is established. Furthermore, the established DRX kinetic model was integrated into the DEFORM-3D finite element software to simulate and validate the extent of DRX during the hot deformation process. A comparison of the results shows that complete DRX (100% volume fraction) occurs at the core of the specimen at 1 100 ℃ and 1 s^-1, whereas no DRX occurs at 900 ℃ and 10 s^-1. Under a typical partial DRX condition (1 000 ℃ and 1 s^-1), the experimentally measured volume fraction of DRX is 42%, while the simulated value is 38%. The overall deviations between the predicted and experimental values are controlled within 5%. Through the comparison of extensive specific data, the accuracy of the model is fully validated, which provides a reliable theoretical basis for predicting DRX behavior and controlling microstructural evolution under complex multi-stage hot working conditions.