Abstract: According to conditions of coal seam soft and unstable failure easily in Yuxi "three-soft" coal seam,based on the comprehensive theory of coal and gas outburst "three factors",the pressure injection measure of combining metal skeleton and high pressure slurry are applied in uncovering the second coal seam with average thickness of 12 m in Chaohua Mine 31 air shaft of Zhengzhou coal industry Co.,Ltd.Practice shows that "three-soft" thick seam,using the pressure injection and solidification measure which combining metal skeleton and high pressure slurry,can effectively prevent coal rib spalling,roof collapsing,coal flowing and gas overrunning.