A hot compression test of industrial pure titanium TA2 was performed using a Gleeble-3800 thermo-mechanical simulator. The true stress–true strain curve was analyzed under deformation temperatures of 750 °C–950 °C and strain rates of 0.01–5 s–1, with the softening phenomenon due to dynamic recrystallization of TA2 being obvious between 750 °C and 850 °C and at a strain rate of 0.01–0.1 s–1. In order to accurately predict the dynamic recrystallization behavior of TA2, a mathematical model of dynamic recrystallization fraction and deformation behavior was developed using the Avrami equation. Simultaneously, a new, modified strain Arrhenius constitutive equation was obtained by introducing the strain rate correction factor k and compensating for the strain rate, establishing the relationship between flow stress and deformation. In this way, the law of flow stress variation during thermal deformation was determined, accurately predicting the flow stress of TA2 and reducing the relative error between the predicted and experimental values to 3.11%.