Abstract: CO is the most commonly used indicator gas for early prediction of coal spontaneous combustion,but its source diversity often brings difficulties to field practice.In order to grasp the adsorption and desorption characteristics of primary CO gas in coal seam,clarify the source of CO in working face and take effective control technology,taking 8# coal seam and 10# coal seam in Xin'an Coal Mine as the background,the occurrence characteristics of primary CO in coal seam were studied by CO desorption experiment and temperature programmed experiment,and the inhibition law of 2%SA+0.5%PCC+1%GDL high water capsule inhibitor material on CO gas in low temperature oxidation of coal was analyzed.The results show that:at room temperature,8# and 10# coal seams have primary CO precipitation,and the average amount of CO precipitation is 0.048 m L/g and 0.054 m L/g,respectively.The temperature programmed experiment found that the CO gas in the working face is mainly derived from the desorption of primary CO and the low temperature oxidation of some coal.The high water capsule material can better inhibit the production of CO in coal seam.The CO inhibition rate of high water capsule on 8#coal seam and 10#coal seam is the highest at 40℃，which is 54% and 47% respectively.Therefore,the production of primary CO can be inhibited by in-situ spraying of high-water capsule materials,thereby improving the prediction accuracy of spontaneous combustion.