Based on method of theory analysis and numerical simulation, feasibility analysis on upward mining on N0. Ml l coal seam in the first mining area of Jike colliery in Yunnan province was stud- ied. The results showed that the height of caving zone after mining is 8. 47 meters, and height of frac- tore zone is 21. 132. 4 meters, the M9 coal seam is in the fracture zone of M11 coal seam after min- ing. Numerical simulation results indicated that the vertical stress in M9 coal seam is obviously re- doted. The maximum height of fracture zone is 26 meters. And the relief effect is significant. It is feasible to make Ml l coal seam as the operation layer for M9 coal seam.