Abstract: Adopting the parameters measure equipment for CH₄ adsorption of coal,the effects of moisture and temperature to CH₄ adsorption of coal were studied.The results have important meaning to perfecting indirect methods for measuring the gas quantity absorbed in coal.Using four coal samples at different metamorphic stages,isothermal adsorption experiments at dryness and different moistures were carried out.The fit precision of Langmuir adsorption model is best.The emendation equation for moisture effects on adsorption was gained.The results of isothermal adsorption experiment at different temperatures showed that the adsorptive capacity of coal decreases with increasing temperature,but the change is not obvious.The emendation equation and its relative error for measuring the gas quantity of coal at laboratory were gained.