Abstract: The isothermal and iso-strain rate hot deformation for pure titanium TA1 was tested on Gleeble-3800 thermal simulator at 650~850℃ with strain rates of 1~20 s^-1 and deformation degree of 60%.The results show that the flow stress of the pure titanium decreases with increase in deforming temperature while increases with strain rate increasing.The constitutive equation of pure titanium was constructed by Arrhenius constitutive model,which can be used as the reference model for the numerical simulation of hot processing of pure titanium.The hot processing map for pure titanium was established according to the dynamic materials model,which is consistent with the experimental observations for the microstructure evolvement of pure titanium.The obtained results in this paper can provide technical base for establishing and optimizing of hot processing of pure titanium.