Abstract: The rheological properties of tara gum were investigated in this paper by using methods of Hakke rotational rheometer and atomic force microscope. Results showed that tara gum was the pseudoplastic fluid with non-thixotropy and viscoelasticity properties which primarily behaved viscosity at low frequency and elasticity at high frequency. The flow model of tara gum was in agreement with the power-law model. The introduction of salt and sucrose could affect the apparent viscosity of tara gum. The apparent viscosity of tara gum did not vary with pHs, and it showed negligible effects under freezing-thawing treatments, but it increased with concentration and decreased at high temperature and after heat-pressure treatments.