Abstract: In order to study influence of temperature and pressure on gas adsorption and desorption characteristics of coal sample, adsorption capacity, isosteric heat of adsorption, Langmuir adsorption constant, initial effective diffusion coefficient and diffusion kinetic parameter under different temperatures(20,25,30,35,40,45,50 ℃) and pressure(0-5 MPa) were analyzed by use of gas adsorption and desorption experimental device. The results show that adsorption capacity decreases with the increase of temperature and increases with the increase of pressure. When adsorption capacity is constant, the higher the temperature is, the greater the gas adsorption pressure is, and isosteric heat of adsorption increases with the increase of adsorption capacity. Langmuir adsorption constant a decreases firstly, and then rises and decreases again with the increase of temperature, and reaches peak value at 45 ℃, while Langmuir adsorption constant b decreases with the increase of temperature. Initial effective diffusion coefficient and diffusion kinetic parameter increase with the increase of temperature, and increase amplitude is most obvious at 35-40 ℃.