Abstract: Isothermal compression tests were conducted on 36CrNi3MoVNb steel using a Gleeble thermal simulation testing machine. Flow stress curves were obtained within the deformation temperature range of 1050 ℃-1200 ℃ and strain rate range of 0.01 s^-1-10 s^-1, and the friction correction was applied to the flow stress data. The effects of deformation temperature and strain rate on the high-temperature flow stress behavior were systematically investigated.A phenomenological constitutive equation for peak stress was established through multivariate linear regression. Material constants at different strain levels were calculated using sixth-order polynomial functions, enabling the development of a strain-compensated Arrhenius constitutive model. This model demonstrates high accuracy with an average absolute relative error(AARE) of 3.51% and a correlation coefficient(R) of 0.997, effectively characterizing the hot deformation behavior of 36CrNi3MoVNb steel. By introducing dynamic recovery(DRV) curves, the dynamic recrystallization(DRX) behavior was analyzed. Critical strain for DRX initiation were determined, and a DRX kinetics model was formulated. This model was integrated into Deform finite element software for coupled DRX simulation analysis, enabling prediction of DRX volume fraction during thermomechanical processing. These findings provide critical references for optimizing hot working parameters of the alloy.