No. 15 coal seam of Zhengzhu Mining Industry of Jingxing Mining Group approaching dangerous outburst area, with high value of gas content and gas pressure, based on CO2 pre-splitting antireflection technology, gas outburst prevention measure of gas pre-drainage in coal seam was adopted, anti-reflection pre-splitting coal advanced permeability of coal seam and improved the gas drainage rate, with broad application and good social and economic benefit.