Abstract: Following an elaboration on the effect on coal slurry treatment produced by five influential factors-presence of clay minerals, size characteristics of solid particles in suspension, degradation of minerals in water, and degree of metamorphism of coal and slurry water characteristics, an introduction is made to the hot points in the research of coal slurry treatment technologies currently made. These include, among others, the settling-dewatering combined technology, intensified sedimentation technology; intensified dewatering technology, and the new ideas in this respect abroad. It points out several major difficulties encountered in the process of coal slurry treatment and the developing trend of this technology.