Abstract: In order to study the entry size suitable for the sub-pillar-free sub-caving method of Rong⁃ guan Mining，and verify whether there is a scientific basis for expanding the size and width of the approach after optimizing and increasing the distance between the approaches，a study on the optimization of stope ap⁃ proach parameters was carried out in a draw test.The ore-drawing monomer test has obtained the develop⁃ mental shape of the ore-drawing ellipsoid in Rongguan Mining at different discharge heights.The ellipsoids drawn by the single test are arranged according to the combination of different stope structure parameters currently used in the well，and it shows that when the height of the segment is 12 m，the distance between the entrances is 15 m，and the width of the entrance is 6 m，which is a more reasonable stope structure. pa⁃ rameter combination.From the 962 m subsection level below，the mine has increased the approach distance to 15 m.The analysis of the three-dimensional test data shows that when the approach distance is increased to 15 m，the width of the approach path needs to be widened to 6 m at the same time，so as to release the el⁃ lipsoids in pairs.So that，the dilution and loss are small.

Key words: caving method ore drawing test, optimization of stope approach parameters, ore drawing monomer test, stereoscopic test of ore drawing