In this study, we combine theory and experiment to calibrate the rheological properties of different materials. Theoretically, we start from two different constitutive models-Bingham and Julien & Lan. We separate the fluid into two layers-shear layer and plug layer, and derive the governing equations and boundary conditions, respectively. Through normalization, we can analyze each equation and solve the leading order velocity and shear stress. For both models, we derive formulas for calibrating rheological properties in rotating viscometer. In experiments, the artificial homogeneous materials are used as a foundation. First, we choose two different flowing type materials-sphere and triangular prism, and then classify the experiments based on different quantity of materials as well as the rotating speed. Since the formulas and the experiment results are acquired, the rheological parameters for both models could be calibrated. With these parameters, we can obtain the unknowns in governing equations-velocity profile, shear stress distribution and the thickness of shear layer. And the velocity profile does not conform to the real state is also found. Besides, there are some data of the shear layer thickness are negative which is wrong. Therefore, we can say the models we adopt- both Bingham and Julien & Lan are not suitable for the granular rheological experiment in this study.