Abstract: With the research background of the medium thickness hanging wall orebody over 1 300 m elevation of Lanjian Iron mining，the structure parameters of the sublevel caving stope under the tilted boundary condition is researched.According to the similarity principle and the coordinator quantity of adjusting to zero，the indoor ore drawing simulation experiment research with the self-made solid ore model is made.According to the experiment data compiled，the dram-out object model is built with the 3Dmine mining engineering software.Combining with the residual condition of heading side，it is obtained that the optimal drawing pace is 5.2 m and rate of advance during ore breaking is 4 m under the structure parameters of the Jianshan mining medium area thickness orebody 20 m segmented height.

Key words: Sublevel caving, Model of ore drawing, Index granular, Rate of advance during ore breaking, 3Dmine