Abstract: In order to determine the impact from gas pressure influence factors in Fukang mining area, selecting the on-site test parameters of gas in Fukang mining area and through the Langmuir equation, seven influencing factors of gas pressure are analyzed. Three main factors are seleted to replace seven original factors affecting gas pressure by principal component analysis, the effect of influencing factor is calculated through the quantitative analysis. The results show that the ash of the coal has the highest influence on the gas pressure, the proportion is 27.9 %, the methane content, the moisture, the pore volume, the coal visual density, gas adsorptive constant are secondary, the proportions are 23.6 %, 20.8 %, 11 %, 10.6 %, 3.9 % respectively. The gas adsorptive constant is the least, the proportion is 2.2 %.