Abstract: Single-pass compressing tests were performed with the Gleeble-3800 thermo-mechanical simulator at the temperature of 900 ℃ to 1 050 ℃ and strain rate of 0.1 s^-1 to 10 s^-1 to investigate the dynamic recrystallization behavior of a kind of vanadium-bearing microalloyed steel and the stress-strain curve was obtained as a result.By the regression analysis of the stress-strain data obtained from the test,the material parameters in the hyperbolic sine constitutive equation and the dynamic recrystallization activation energy,including the relationship between the critical strain and parameter Zener-Hollomon,were determined.Based on the conditions for the deformation,the dynamic recrystallization diagram of the tested steel was drawn.