Abstract: In order to ensure production capacity and mining safety of the second-step stope，3D-FEM was conducted to analyze the stability of the second-step stope with different structure parameters to select the safe and reasonable stope parameters.Stress and displacement of roof and hanging-side rock with different structure parameters were calculated and analyzed to judge the stability of the stope.Result showed that，the stress and displacement of roof and hanging-side rock was large when the height of the stope was 12 meter，and the stability of the stope was poor；the change rate of the stress and displacement of roof and hanging-side rock was a growing trend，and the stability of the stope was worse with width increase.So the safe and reasonable width and height of the second-step stope was 10meter.The results of the analysis applied to practical engineering showed that the parameters are safe and reasonable，and safe and efficient mining of the mine was guaranteed.

Key words: Second-step stope, Stope structural parameters, FEM simulation, Engineering application