Abstract: Taking Yanzishan slime as the research object, industrial analysis, elemental analysis and ash fusion analysis were carried out. The combustion characteristics of coal slime and CO2 atmosphere gasification characteristics were analyzed by TG-DTG-DSC. The rheology of coal water slurry were tested with naphthalene sulfonic acid sodium formaldehyde as the dispersant. The results showed that, at hearting rate of 10, the ignition temperature of the slime is 456 °C in O2 atmosphere and the depolymerization temperature is 355 °C in CO2 atmosphere; the slime could be prepared to a high concentration of coal water slurry when the concetration could reach to 72.01% at optimized dispersant dosage of 1.2%, and the slurry presented shearing thining characteristic. Considering the low sulfur content and high ash content, the slime could be used as a blending material for combusting and gasifying coal water slurry preparation to realize efficient and green utilization.