Abstract: In order to rationally layout the gas high level drainage gateway and study the O ring distribution law, taking the K8205 coal mining face in No.3 Mine in Yangquan Mining Area as the project background, the discrete element numerical simulation method was applied to study the coal mining height of coal mining affected to the variation formation of the 0 ring. The simulation results showed that under the certain key stratum structure condition of the overburden strata, the width of the 0 ring would be increased with the coal mining height increased.The height of the 0 ring was lowly affected by the coal mining height.When the coal height varied within a certain range, the height of the 0 ring would be below the key stratum of the overburden strata.When the coal mining height was increased, the rotary angle of the first r otary rock block in the liner beam structure would be increased, thus the bending section length of the liner beam would be increased and the width of the 0 ring would be increased.Based on the study results, an optimized plan of the strike high level gas drainage gateway under the different seam mining height was provided.