Abstract: The dynamic recrystallization process of 3Cr2Mo hot rolled steel plate was studied by plane strain method. The plane strain thermal simulation tests were performed at temperatures of 950-1 100℃ and the strain rates of 0.1-50 s^-1 on Gleeble-3500 thermal-mechanical simulator. The smoothed flow stress data was investigated for the analysis of the dynamic recrystallization in the process of thermal deformation. The activation energy of dynamic recrystallization was determined as 309.05 kJ/mol by the plane strain simulation data. The equation of peak strain was developed with the flow stress data by Zener-Hollomon parameter. The dynamic recrystallization transformation of 3Cr2Mo steel was studied by the flow stress data at different strain rates and temperatures,and the dynamic recrystallization kinetics equation was developed by Avrami equation. By comparison between experimental data and model calculated values of volume fraction of dynamic recrystallization transformation, it is proved that dynamic recrystallization kinetics equation established can effectively predict the dynamic recrystallization process.