Abstract: The co-slurryability of anthracite and modified sewage sludge has been investigated with two dispersants of naphthalene sulfonate sodium formaldehyde condensate and sodium polycarboxylate. The results show that co-slurryability concentration is higher than 60% while the mass ratio of dry sewage to coal is lower than 4∶100. With increasing the mass ratio of dry sewage, co-slurryability concentration decreases. The stability of coal-watersewage slurry becomes better than that of coal-water slurry. When the ratio of dry sewage to coal is 4∶100, the period of stability is more than 160h, similar to the coal-water slurry with stabilizer B. Coal-water-sewage slurry is pseudoplastic fluid and favorable to transportation. The loose floccules characteristic, honeycomb surface and great adsorption ability of sewage play the key role in improvement of concentration, stability and rheology of the coal-water-sewage slurry.