Abstract: The hyperconcentration mixture of fine particles belongs to the category of Bingham fluid. For such fluid, Bingham yield stress and viscosity factor are two important parameters, and a lot of formulas were given,most of them are empirical. However, the application of these formulas are limited owing to that the grain size distributions are not well considered. In this paper,the maximum concentration, as well as the viscosity and Bingham yield stress of hyperconcentration fluid which consists of both natural sediments and bakelite powder are studied theoretically and experimentally, and calculating formulas are developed. All the formulas obtained are in good agreement with the experimental data measured by the authors as well as by other investigators.