Abstract: In order to improve rheological property of the oil water coal slurry（hereafter referred as to OWCS） on Shenfu coal,the effect of categories of dispersant and its dosage,the water-coal ratio,temperature on viscosity of OWCS is discussed,at the same time analysis of regression for rheological curves is studied under experimental temperature. The results show that apparent viscosity of OWCS is subject to categories of dispersant and its dosage,however,high content of coal in OWCS is not good to disperse materials and reduce viscosity; the rheological property is suitable to the Herschel-Bulkley mode,so that it can be determined by the flow index.