Abstract: The rheological properties of gangue cemented backfill slurry under different mass concentrations and standing time were studied based on Talbot grading theory, and the influence of particle grading on rheological parameters was analyzed by grey correlation degree. The results show that when the mass concentration of slurry is 76 % to 80 %, the yield stress τ₀ of slurry increases with the increase of concentration, and the effect of mass concentration on the yield stress of slurry with high fine gangue content is more obvious. At the same concentration, the yield stress correlation coefficient of slurry increases with the increase of particle size. When the concentration is different, the correlation coefficient is related to the concentration. The yield stress increases with the increase of the standing time of the slurry, and the growth rate is faster in 0-50 min, and the growth rate slows down in 50-90 min, and the time effect is more obvious to the yield stress of the slurry with low coefficient k. As the shear rate increases to the critical shear rate, the rheological state of the slurry changes from laminar flow to turbulent flow.