Abstract: Selected four different coal slimes,and then take sodium lignosulfonate as additives,used three different technologies to make coal water slurry.Studied and compared the slurry concentration,mobility,stability and other aspects of the properties of coal water slurry.The results show that the slurry ability relevant to the selection of technology and the nature of slime slurry,when the dry slime technology has the best slurry ability,mobility and stability.Dry slime technology is favorable to improve the slurry concentration,and the float coal after flotation technology is the least favorable to improve the slurry concentration.Under the high-ash condition,the main influence factor of the fixed viscosity concentration is the ash content.Under the low-ash condition,the main influence factor of the fixed viscosity concentration is the carbon content.