Abstract: As there are many complex influencing factors of gas pressure, this paper obtained the relation of gas pressure and burial depth,coal modulus of elasticity, poisson ratio, temperature gradient and in-situ stress gradient, through establishing theoretical model.The relationship of gas pressure and the relevant influencing factors are analyzed by combining with numerical analysis. Analysis shows that the gas pressure increases with the increase of coal seam burial depth and in the same coal seam.the gas pressure decreases with the increase of coal modulus, poisson ratio, temperature gradient, and increases with the increase of in-situ stress gradient. What's more, gas pressure gradient increases with the increase of coal modulus and poisson ratio, the change rate of gas pressure gradient is relatively smaller when the coal modulus and poisson ratio is smaller, the change rate of gas pressure gradient increases rapidly when the coal modulus and poisson ratio is large.The gas pressure gradient increases with the increase of temperature gradient and in-situ stress gradient and varies almost linearly.