Abstract: The shape of starch granule structure was researched by the analyzing system of biological microscope, and the pastes of the maize starch were prepared based on different ratios between starch and water. The rheological properties of the starch pastes were researched by rotational viscometer, and the rheological models of the starch pastes were concluded, the fluid models were validated. The results showed that the shear stress of the maize starch pastes is increased as the sheer rate is increased and the shear stress is increased with the increase of the ratio of starch with water under the identical sheer rate, but the shear stress is decreased with the increase of the temperature of the starch pastes under the identical ratio of starch with water and the identical sheer rate. The rheological properties data of the maize starch pastes were regressed by nonlinear regression method and their rheological models were established. The results showed that the maize starch pastes belong to a yield-pseudoplastic fluid, the rheological properties of maize starch pastes were characterized by yield pseudoplastic model. The research on the rheological properties and fluid models of starch pastes will provide theoretical foundation for development and application of maize starch.