Abstract: Abstract：In order to reduce the environmental hazards of two industrial by-products, coal slime and high-sulfur petroleum coke, the coal-water slurry gasification process is used for its resource utilization. Methylene perylene naphthalene sulfonate (NNO) was used as a system. The dispersant for pulp was mixed with petroleum coke for pulping, and the influence of the amount of coal slime addition on the pulping concentration, rheology and stability of petroleum coke was investigated. The test results show that petroleum coke has good slurability. When the amount of dispersant NNO added is 0.8% of the dry base petroleum coke mass, the fixed viscosity concentration of petroleum coke is 67.63%; when the amount of slime is increased to 20% The slurry with a constant viscosity of 68.15% can be prepared. The slurry changes from swelling plasticity to pseudoplastic fluid, showing shear thinning characteristics. The water release rate after 7 days is only 4.11%, which is less than when no slime is added. The addition of slime improves the rheology of the slurry, improves the stability of the slurry, and facilitates the storage and transportation of the slurry.