Aqueous suspension rheology of three kinds of palygorskite clays from Jiangsu and Anhui was investigated as a function of the composition of clays, and different concentrations of NaCl solution，pH, different electrolyte solutions, dosages of dispersant, and linear methods were applied for fitting the rheological parameters to Casson model. The results show that small amounts of other impure minerals do not affect the rheological properties seriously, and that the samples subjected to crushing from the original clays are in line with the Casson model. The sizes of clays, pH values, different electrolyte solutions, and the addition of dispersant can affect the rheological properties, and the addition of dispersant is the most important affecting factor. Nevertheless, the effect of the concentrations of NaCl solution is not significant.