Abstract: With the increase of coal mining depth, the permeability of coal seam will decrease, and the gas content will increase continuously. In order to solve the problem of high gas and low permeability coal seam gas drainage problem, search for effective, economic, applicable to a wide range of Antireflective and new method for CO2 coal seam presplit ar engineering test in the new company and security Jiuzheng Xiang wa Bei Buddha South four mining area, through the gas drainage concentration, flow rate, drainage radius and other parameters of observation the analysis results show that CO2 can be pre splitting gas average concentration increased from 9% before the pre splitting pre splitting after 19%, play a very good antireflective effect; effective radius of pre splitting effect within 30-50m range in CO2; pre splitting blasting hole, around the area of stress concentration the shock wave, in the process of communication, there are wave cyclic stress releasing stress concentration and stress release, this law affects CO2 pre-splitting effect.