Abstract: In response to the issue of significant ore loss and dilution in the sublevel caving method without pillars, a multi-stage, multi-entry ore-pass model with a geometric ratio of 1:50 was designed. By altering the combinations of cut-off grades, the changes in the waste rock funnel, marker particles, and ore-passing indicators were observed and recorded to study the impact of different cut-off grade combinations on the ore-passing effect. The experimental results indicate that different combinations of cut-off grades have a significant influence on the recovery rate and dilution rate of the ore, especially the cut-off grade in the second stage, which has a notable impact on the overall recovery rate with a variation amplitude exceeding 30 %. According to the ore and rock output at different cut-off grades, the 0-70 % cut-off grade can be divided into three stages, each with distinct characteristics of ore and rock output changes. In the low cut-off grade stage, the ore recovery rate is relatively high, and the waste rock mixing rate is low. In the medium cut-off grade stage, the waste rock mixing rate increases. In the high cut-off grade stage, the amount of waste rock increases sharply, leading to a significant decrease in the proportion of ore. When the cut-off grades for the three stages are set at 20 %, 70 %, and 70 % respectively, the ore-passing effect is optimal. Compared with the current cut-off grade ore-passing, the recovery rate is increased by 1.56 %, and the dilution rate is reduced by 2.07 %. Therefore, by reasonably designing the cut-off grades for each stage, the ore recovery rate can be significantly improved, while reducing the dilution phenomenon, thus achieving the maximization of resource utilization.