Abstract: The effect of chute angle on mixing charging law was analyzed under the fixed-point burden distribution. First, an experiment was performed under mixing charging process, and the burden trajectory and the pile structure were obtained under different chute angles. The segregation of mixing materials with different sizes during the materials descending was also analyzed. Then the charging process was simulated by distinct element method (DEM), and the mathematical simulation results were analyzed in detail. The results showed that the mathematical simulation results are in good agreement with the experimental results. And the information of the pile structure and the radial porosity profile can provide some reference to adjust the gas flow distribution.