Abstract: Coal seam gas pressure measurement is one of the basic parameters on gas control in coal mine.The ideal measurement condition is drilling manometry through rock,but the majority of the mine had to use coal seam drilling manometry due to the major roadway arranged in coal seam.Currently,the traditional sealing can not be applied to the demand of coal seam sealing because of the sealing difficulty in mining-coal bed gas pressure measurement.Therefore,yellow mud-polyurethan fast sealing method was proposed,and field experiments in Jiulishan coal mine were done,which achieved good effect.