Yangquan Mining Group No. 1 Mine S3 mining area downhill belt machine head chamber roadway with height 3.5 m, width 6.5 m, due to roadway influenced seriously by ground stress, high caving in some area, the highest point in the roadway is 7 m. Because the roadway is belt roadway, the sudden increase of roadway section may cause negative influence for underground production, based on the geological mining condition of the roadway, anchor nets support technology was adopted, with good support effect.