Abstract: Coal-water slurries (CWS) a boiler fuels represent a new area of research in the coal utilization. They are concentrated suspensions. The knowledge of their rheological behaviour plays an important role in the preparation, storage, pumping and atomization. According to the assumption of a thixotropic fluid as a material of the rate type, and using the experimental method of the equivalent structure, the rheological equation of state and the rate equation of antithixotropic of CWS, are determined in this pap...