Abstract: The rheological parameters of filling slurry are important indicators to evaluate the characteristics of filling slurry pipeline transport, while the rheological experimental conditions are usually not available at the mine site, and the flow properties of filling slurry are mainly evaluated by the slump test. In this paper, we used mini-slump cone to conduct slump experiment, established the analytical model between the spread of mini-slump cone and yield stress, obtained the simplified calculation model according to the shape of slurry after flowing, calculated the yield stress of the slurry based on the simplified model, and compared the theoretical value with the experimental value of yield stress tested by rheometer. The results show that the relative error range between the theoretical and experimental values is large when the mass fraction is low, and the relative error between the two is within 25%, with an average error of 16.79%; as the mass fraction increases, the error gradually decreases to within 15%, with an average error of 8.81%. Considering the effect of mass fraction, a correction factor based on mass fraction was proposed, and the relative error between the theoretical and experimental values of yield stress after correction was reduced to within 10%, with an average error of 3.54%. In this study, the mini-slump cone test not only saves the experimental material and labor intensity compared with the traditional slump test, but also can effectively characterize the yield stress of the slurry, which is of practical guidance for the evaluation of the flowability of mine filling slurry.